c언어 문자열 치환하기

# replace.c

#include <stdio.h> #include <stdlib.h> #include <string.h>    // Function to replace a string with another // string char* replaceWord(const char* s, const char* oldW,                   const char* newW) {     char* result;     int i, cnt = 0;     int newWlen = strlen(newW);     int oldWlen = strlen(oldW);        // Counting the number of times old word     // occur in the string     for (i = 0; s[i] != '\0'; i++) {         if (strstr(&s[i], oldW) == &s[i]) {             cnt++;                // Jumping to index after the old word.             i += oldWlen - 1;         }     }        // Making new string of enough length     result = (char*)malloc(i + cnt * (newWlen - oldWlen) + 1);        i = 0;     while (*s) {         // compare the substring with the result         if (strstr(s, oldW) == s) {             strcpy(&result[i], newW);             i += newWlen;             s += oldWlen;         }         else             result[i++] = *s++;     }        result[i] = '\0';     return result; }    // Driver Program int main() {     char str[] = "xxforxx xx for xx";     char c[] = "xx";     char d[] = "Geeks";        char* result = NULL;        // oldW string     printf("Old string: %s\n", str);        result = replaceWord(str, c, d);     printf("New String: %s\n", result);        free(result);     return 0; }

# gcc replace.c -o replace

# ./replace

[출처] https://www.geeksforgeeks.org/c-program-replace-word-text-another-given-word/