Question

How to find and replace all occurrences of a word in a string with C

Answer 1

#include <stdio.h>
#include <string.h>
 
void replaceAll(char *s, const char *fromword, const char *toword) {
    char *pos, tmp[100];
    int len = strlen(fromword);
    int i = 0;
    
    while ((pos = strstr(s, fromword)) != NULL) {
        strcpy(tmp, s);
        i = pos - s;
        s[i] = '\0';
        strcat(s, toword);
        strcat(s, tmp + i + len);
    }
}
      
        
int main()
{
    char s[128] = "python c cpp csharp pythonpython rust go python";
 
    replaceAll(s, "python", "JAVA");
     
    puts(s);
     
    return 0;
}
         
           
           
           
/*
run:
           
JAVA c cpp csharp JAVAJAVA rust go JAVA
        
*/

 

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