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C program: Replace a word in text with another given word

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Release: 2023-09-08 22:37:02
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C program: Replace a word in text with another given word

在这个程序中,我们给定了三个字符串 txt、oldword 和 newword。我们的任务是创建一个 C 程序,将文本中的一个单词替换为另一个给定的单词。

该程序将搜索文本中所有出现的 oldword,并将其替换为 newword

让我们举个例子来理解这个问题 -

输入

text = “I am learning programming”
oldword = “learning”
newword = “practicing”
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输出

“I am practicing programming”
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为了解决这个问题,我们首先会找到字符串中旧单词出现的次数,然后创建一个新的字符串,将文本中的单词替换掉。

C程序:用另一个给定的单词替换文本中的一个单词

// C程序:用另一个给定的单词替换文本中的一个单词

示例

 在线演示

#include 
#include 
#include 
void replaceWordInText(const char *text, const char *oldWord, const char *newWord) {
   int i = 0, cnt = 0;
   int len1 = strlen(newWord);
   int len2 = strlen(oldWord);
   for (i = 0; text[i] != '\0'; i++) {
      if (strstr(&text[i], oldWord) == &text[i]) {
         cnt++;
         i += len2 - 1;
      }
   }
   char *newString = (char *)malloc(i + cnt * (len1 - len2) + 1);
   i = 0;
   while (*text) {
      if (strstr(text, oldWord) == text) {
         strcpy(&newString[i], newWord);
         i += len1;
         text += len2;
      }
      else
      newString[i++] = *text++;
   }
   printf("New String: %s

", newString); } int main() { char str[] = "I am learning programming"; char c[] = "learning"; char d[] = "practicing"; char *result = NULL; printf("Original string: %s

", str); replaceWordInText(str, c, d); return 0; }

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输出

Original string: I am learning programming
New String: I am practicing programming
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source:tutorialspoint.com
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