72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
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/*
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* C Program to Search a Word & Replace it with the Specified Word
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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/*Function to replace a string with another string*/
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char *rep_str(const char *s, const char *old, const char *new1)
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{
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char *ret;
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int i, count = 0;
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int newlen = strlen(new1);
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int oldlen = strlen(old);
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for (i = 0; s[i] != ''; i++)
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{
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if (strstr(&s[i], old) == &s[i])
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{
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count++;
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i += oldlen - 1;
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}
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}
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ret = (char *)malloc(i + count * (newlen - oldlen));
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if (ret == NULL)
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exit(EXIT_FAILURE);
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i = 0;
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while (*s)
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{
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if (strstr(s, old) == s) //compare the substring with the newstring
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{
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strcpy(&ret[i], new1);
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i += newlen; //adding newlength to the new string
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s += oldlen;//adding the same old length the old string
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}
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else
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ret[i++] = *s++;
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}
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ret[i] = '';
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return ret;
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}
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int main(void)
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{
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char mystr[100], c[10], d[10];
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printf("Enter a string along with characters to be rep_strd:
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");
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gets(mystr);
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printf("Enter the character to be rep_strd:
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");
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scanf(" %s",c);
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printf("Enter the new character:
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");
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scanf(" %s",d);
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char *newstr = NULL;
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puts(mystr);
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newstr = rep_str(mystr, c,d);
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printf("%s
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", newstr);
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free(newstr);
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return 0;
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}
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Enter a string along with characters to be rep_strd:
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prrrogram C prrrogramming
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Enter the character to be rep_strd:
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rr
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Enter the new character:
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mmm
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prrrogram C prrrogramming
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pmmmrogram C pmmmrogramming
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