Question

我想在c中编写一个程序来获取第一个字符串的字符串是“ddabcdd” 并且第二个字符串应该在第一个字符串内，就像字符串编号2是“abc”那么第二个字符串应该被字符串编号1中的第三个字符串替换，就像第三个字符串是“fff”，第一个字符串应该更改为“ddfffdd”!!!!!!

第一个字符串：ddabcdd

第二个字符串：abc

第三个字符串：fff

更改后的第一个字符串：ddfffdd

Answer 1

您需要查找并替换该单词，以便参考以下程序，

// C program to search and replace

// all occurrences of a word with

// other word.

#include <stdio.h>

#include <string.h>

#include <stdlib.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[] = "ddabcdd";

    char c[] = "abc";

    char d[] = "fff";

 

    char *result = NULL;

 

    // oldW string

    printf("Old string: %sn", str);

 

    result = replaceWord(str, c, d);

    printf("New String: %sn", result);

 

    free(result);

    return 0;

}

感谢。

如何将字符串改为另一个字符串

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