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fread() and fwrite() in C

Posted on October 29, 2021October 29, 2021 By christo No Comments on fread() and fwrite() in C

The functions fread() and fwrite() are a somwhat complex file handling functions used for reading or writing chunks of data containing NULL characters (‘\0’) terminating strings

The function prototype of fread() and fwrite() is

size_t fread(void *ptr, size_t sz, size_t n, FILE *fp)
size_t fwrite(const void *ptr, size_t sz, size_t n, FILE *fp);

Example of fread() and fwrite() in C

#include <stdio.h>
#define MAX_SIZE 1024
main ()
{
 FILE *fp, *gp;
 char buf[MAX_SIZE];
int i, total = 0;
 if ((fp = fopen("data1.txt", "r") ) == NULL)
 printf("Error in data1.txt file \n");
 else if ((gp=fopen("data2.txt", "w")) == NULL)
 printf("Error in data2.txt file \n");
 else
 {
 while(i=fread(buf, 1, MAX_SIZE, fp))
 {
 fwrite(buf, 1, MAX_SIZE, gp);
 total +=i;
 }
 printf("Total is %d\n", total);
 }
 fclose(fp);
 fclose(gp);
}

c language Tags:c language, fread() and fwrite() in C

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