Linux下的C编程程序源代码

hobby! · 发表于 2004-11-22 10:08:21

#include <sys/types.h>

#include <stdio.h>

#define BUF_SIZE 1024

int main(void)

{

char buf[BUF_SIZE];

FILE *source, *backup;

if(!(source=fopen("source.dat", "r")))

{

        printf("Error in opening file.\n");

   exit(1);

}

if(!(backup=fopen("backup.dat", "w")))

{

        printf("Error in creating file.\n");

   exit(1);

}

while(fread(buf, sizeof(buf), 1, source)==1)

{

        if(fwrite(buf, sizeof(buf), 1,backup))

        {

            printf("Error in wrinting file.\n");

            exit(1);

        }

}

if(ferror(source)==0)

{

printf("Error in reading file.\n");

exit(1);

}

if(!fclose(source))

{

        printf("Error in close file.\n");

        exit(1);

}

if(fclose(backup))

{

        printf("Error in close file.\n");

        exit(1);

}

}

hobby! · 发表于 2004-11-22 10:08:42

#include <sys/types.h>

#include <stdio.h>

int main(void)

{

float value, total[10];

int count, label;

FILE *fp;

for(count=0; count<10; count++)

        total[count]=0;

if(!(fp=fopen("test.dat", "r")))

{

        printf("Error in open file.\n");

        exit(1);

}

while(!fscanf(fp, "%d%g", &label, &value))

{

        total[label]+=value;

}

for(count=0; count<10; count++)

{

        printf("%d: %f\n", count, total[count]);

        return 0;

}

}

hobby! · 发表于 2004-11-22 10:09:25

#include <sys/types.h>

#include <stdarg.h>

#include <stdio.h>

int main(void)

{

float value, total[10];

int count, label;

va_list ap_read, ap_write;

FILE *fp;

for(count=0; count<10; count++)

        total[count]=0;

if(!(fp=fopen("test.dat", "r")))

{

        printf("Error in open file.\n");

        exit(1);

}

ap_read=("&label", "&value");

while(!fscanf(fp, "%d%g", ap_read))

{

        total[label]+=value;

}

ap_write=("count", "total[count]");

for(count=0; count<10; count++)

{

        printf("%d: %f\n", ap_write);

        return 0;

}

}

hobby! · 发表于 2004-11-22 10:10:49

#include <sys/types.h>

#include <stdarg.h>

#include <stdio.h>

int main(void)

{

float value, total[10];

int count, label;

va_list ap_read, ap_write;

FILE *fp;

for(count=0; count<10; count++)

        total[count]=0;

if(!(fp=fopen("test.dat", "r")))

{

        printf("Error in open file.\n");

        exit(1);

}

ap_read=("&label", "&value");

while(!fscanf(fp, "%d%g", ap_read))

{

        total[label]+=value;

}

ap_write=("count", "total[count]");

for(count=0; count<10; count++)

{

        printf("%d: %f\n", ap_write);

        return 0;

}

}

hobby! · 发表于 2004-11-22 10:16:51

#include <stdio.h>

int character;

char *token;

void lexicure(void);

int main(void)

{

lexicure();

while(character)

{

        fprintf(stdout, token);

        lexicure();

     }



     exit(0);

}

void lexicure(void)

{

character=getchar();

switch(character)

{

        case 'A'...'Z':

            while((('A'<=character)&&('Z'>=character))|| (('0'<=character)&&('9'>=character)))

            {

            token+=character;

            character=getchar();

            }

            if(character!=EOF)

ungetc(character, stdin);

            else

            ungetc(0, stdin);

            break;

        case '0'...'9':

            while(('0'<=character)&&('9'>=character))

            {

            token+=character;

            character=getchar();

            }

            if(character!=EOF)

ungetc(character, stdin);

            else

            ungetc(0, stdin);

            break;

}

}

hobby! · 发表于 2004-11-22 10:23:49

#include <sys/types.h>

#include <stdio.h>

#define BUF_SIZE 1024

int main(void)

{

char buf[BUF_SIZE];

FILE *source, *backup;

if(!(source=fopen("source.dat", "r")))

{

        printf("Error in opening file.\n");

   exit(1);

}

if(!(backup=fopen("backup.dat", "w")))

{

        printf("Error in creating file.\n");

   exit(1);

}

while(fgets(buf, sizeof(buf), source))

{

        if(fputs(buf, backup))

        {

            printf("Error in wrinting file.\n");

            exit(1);

        }

}

if(ferror(source)==0)

{

printf("Error in reading file.\n");

exit(1);

}

if(!fclose(source))

{

        printf("Error in close file.\n");

        exit(1);

}

if(fclose(backup))

{

        printf("Error in close file.\n");

        exit(1);

}

}

hobby! · 发表于 2004-11-22 10:25:56

#include <stdio.h>

#define MAXLINE 1024

int main(void)

{

char line[MAXLINE];

FILE *fp;

if(!(fp=tmpfile()))

{

        printf("tempfile error");

        exit(1);

}

if(!fputs("This is a temp file.\n", fp))

{

        printf("write error.\n");

        exit(1);

}

rewind(fp);

if(!fgets(line, sizeof(line), fp))

{

        printf("read error.\n");

        exit(1);

}

printf("%s\n", line);

exit(0);

}

hobby! · 发表于 2004-11-22 10:32:31

#include <stdio.h>

#define MAXLINE 1024

int main(void)

{

char name[L_tmpnam], line[MAXLINE];

FILE *fp;

if(!(fp=fopen(tmpnam(name),"r+")))

{

        printf("tempfile error");

        exit(1);

}

unlink(name);

if(!fputs("This is a temp file.\n", fp))

{

        printf("write error.\n");

        exit(1);

}

rewind(fp);

if(!fgets(line, sizeof(line), fp))

{

        printf("read error.\n");

        exit(1);

}

printf("%s\n", line);

exit(0);

}

hobby! · 发表于 2004-11-22 10:33:05

#include <stdio.h>

#define MAXLINE 1024

int main(void)

{

char line[MAXLINE];

char *name;

FILE *fp;

if(!(fp=fopen(name=tempnam("/home/stevents",NULL),"r+")))

{

        printf("tempfile error");

        exit(1);

}

   unlink(name);

if(!fputs("This is a temp file.\n", fp))

{

        printf("write error.\n");

        exit(1);

}

rewind(fp);

if(!fgets(line, sizeof(line), fp))

{

        printf("read error.\n");

        exit(1);

}

printf("%s\n", line);

exit(0);

}

hobby! · 发表于 2004-11-22 10:33:34

#include <stdio.h>

#include <string.h>

char *upcase(char *inputstring);

int main(void)

{

char *str1, *str2;

str1=upcase("Hello");

str2=capitao("Goodbye");

printf("str1=%s,str2=%s\n", str1, str2);

return 0;

}

char *upcase(char *oldstring)

{

int counter;

char newstring[100];

strcpy(newstring, oldstring);

for(counter=0; counter<strlen(newstring); counter++)

{

if(newstring[counter]>=97&&newstring[counter]<=122)

newstring[counter]-=32;

}

return newstring;

}

hobby! · 发表于 2004-11-22 10:34:57

#include <stdio.h>

#include <string.h>

void upcase(char *inputstring,char *newstring);

int main(void)

{

char str1[100], str2[100];

upcase("Hello" , str1);

capitao("Goodbye", str2);

printf("str1=%s, str2=%s\n", str1, str2);

return 0;

}

void upcase(char *inputstring,char *newstring)

{

int counter;

strcpy(newstring, inputstring);

for(counter=0; counter<strlen(newstring); counter++)

{

if(newstring[counter]>=97&&newstring[counter]<=122)

newstring[counter]-=32;

}

return ;

}

hobby! · 发表于 2004-11-22 10:35:19

#include <stdio.h>

#include <string.h>

void upcase(char *inputstring,char *newstring);

int main(void)

{

char str1[4], str2[4];

upcase("Hello" , str1);

capitao("Goodbye", str2);

printf("str1=%s, str2=%s\n", str1, str2);

return 0;

}

void upcase(char *inputstring, char *newstring)

{

int counter;

strncpy(newstring, inputstring,sizeof(newstring));

for(counter=0; counter<strlen(newstring); counter++)

{

if(newstring[counter]>=97&&newstring[counter]<=122)

newstring[counter]-=32;

}

return ;

}

hobby! · 发表于 2004-11-22 10:35:44

#include <stdio.h>

#include <string.h>

char *upcase(char *inputstring);

int main(void)

{

char *str1, *str2;

str1=upcase("Hello" );

str2=capitao("Goodbye");

printf("str1=%s, str2=%s\n", str1, str2);

free(str1);

free(str2);

return 0;

}

char *upcase(char *inputstring)

{

char *newstring;

int counter;

if(!(newstring=malloc(strlen(inputstring)+1)))

{

printf("ERROR ALLOCATING MEMORY! \n");

exit(255);

}

strcpy(newstring, inputstring);

for(counter=0; counter<strlen(newstring); counter++)

{

if(newstring[counter]>=97&&newstring[counter]<=122)

newstring[counter]-=32;

}

return newstring;

}

hobby! · 发表于 2004-11-22 10:44:06

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define DATASIZE 10

typedef struct stringdata

{

char *string;

int iscontinuing;

struct stringdata *next;

} mydata;

mydata *append(mydata *start, char *input);

void displaydata(mydata *start);

void freedata(mydata *start);

int main(void)

{

char input[DATASIZE];

mydata *start=NULL;

printf("ENTER SOME DATA,AND PRESS Ctrl+D WHEN DONE. \n");

while(fgets(input, sizeof(input), stdin))

{

        start=append(start, input);

}

displaydata(start);

freedata(start);

return 0;

}

mydata *append(mydata *start, char *input)

{

   mydata *cur=start, *prev=NULL, *new;

while(cur)

{

        prev=cur;

        cur=cur->next;

}

cur=prev;

new=malloc(sizeof(mydata));

if(!new)

{

        printf("COULDN’T ALLOCATE MEMORY! \n");

        exit(255);

}

if(cur)

        cur->next=new;

else

        start=new;

cur=new;

if(!(cur->string=malloc(sizeof(input)+1)))

{

printf("ERROR ALLOCATING MEMORY! \n");

exit(255);

}

strcpy(cur->string, input);

cur->iscontinuing=!(input[strlen(input)-1]=='\n'||input[strlen(input)-1]=='\r');

cur->next=NULL;

return start;

}

void displaydata(mydata *start)

{

mydata *cur;

int linecounter=0, structcounter=0;

int newline=1;

cur=start;

while(cur)

{

if(newline)

        printf("LINE %d:",++linecounter);

structcounter++;

printf("%s",cur->string);

newline=!cur->iscontinuing;

cur=cur->next;

}

printf("THIS DATA CONTAINED %d LINES AND WAS STORED IN %d STRUCTS. \n",

linecounter,structcounter);

}

void freedata(mydata *start)

{

mydata *cur, *next=NULL;

cur=start;

while(cur)

{

        next=cur->next;

   free(cur->string);

        free(cur);

        cur=next;

}

}

hobby! · 发表于 2004-11-22 10:45:11

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define DATASIZE 10

typedef struct stringdata

{

char *string;

int iscontinuing;

struct stringdata *next;

} mydata;

mydata *append(mydata *start, char *input);

void displaydata(mydata *start);

void freedata(mydata *start);

int main(void)

{

char input[DATASIZE];

mydata *start=NULL;

printf("ENTER SOME DATA,AND PRESS Ctrl+D WHEN DONE. \n");

while(fgets(input, sizeof(input), stdin))

{

        start=append(start, input);

}

displaydata(start);

freedata(start);

return 0;

}

mydata *append(mydata *start, char *input)

{

   mydata *cur=start, *prev=NULL, *new;

while(cur)

{

        prev=cur;

        cur=cur->next;

}

cur=prev;

new=malloc(sizeof(mydata));

if(!new)

{

        printf("COULDN’T ALLOCATE MEMORY! \n");

        exit(255);

}

if(cur)

        cur->next=new;

else

        start=new;

cur=new;

if(!(cur->string=malloc(sizeof(input)+1)))

{

printf("ERROR ALLOCATING MEMORY! \n");

exit(255);

}

strcpy(cur->string, input);

cur->iscontinuing=!(input[strlen(input)-1]=='\n'||input[strlen(input)-1]=='\r');

cur->next=NULL;

return start;

}

void displaydata(mydata *start)

{

mydata *cur;

int linecounter=0, structcounter=0;

int newline=1;

cur=start;

while(cur)

{

if(newline)

        printf("LINE %d:",++linecounter);

structcounter++;

printf("%s",cur->string);

newline=!cur->iscontinuing;

cur=cur->next;

}

printf("THIS DATA CONTAINED %d LINES AND WAS STORED IN %d STRUCTS. \n",

linecounter,structcounter);

}

void freedata(mydata *start)

{

mydata *cur, *next=NULL;

cur=start;

while(cur)

{

        next=cur->next;

   free(cur->string);

        free(cur);

        cur=next;

}

}

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