C program to replace the sub string with another string.

C Strings:
Write a C program to replace the sub string in a string with another string.
In this program, We replace string with another string, if the entered string is the sub string of main string, otherwise function replace_str returns the original string as it is. Read more about C Programming Language .

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#include <stdio.h>
#include <string.h>

char *replace_str(char *str, char *orig, char *rep)
static char buffer[4096];
char *p;

if(!(p = strstr(str, orig)))
return str;

strncpy(buffer, str, p-str);
buffer[p-str] = '';

sprintf(buffer+(p-str), "%s%s", rep, p+strlen(orig));

return buffer;

int main(void)
char str[100],str1[50],str2[50];
printf("Enter a one line string..n");
printf("Enter the sub string to be replaced..n");
printf("Enter the replacing string....n");
puts(replace_str(str, str1, str2));

return 0;
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