Write a C program to find a string within a sentence and replace it with another string.

Write a C program to find a string within a sentence and replace it with another string.

Program Code:

#include <stdio.h>

int main()

{

char str1[50], str2[50], str3[50], temp[50];

int len1, len2, len3, i, j, p, match, k;

printf("\n\n\t ENTER A SENTENCE:");

gets(str1);

printf("\n\n\t ENTER A STRING WHICH YOU WANT TO DELETE: ");

gets(str2);

printf("\n\n\t ENTER A NEW STRING WHICH YOU WANT TO INSERT: ");

gets(str3);

i=0; //Finding the length of sentence

while(str1[i]!='\0')

{

i++;

}

len1 = i-1;

i=0; //Finding the length of string, to delete

while(str2[i]!='\0')

{

i++;

}

len2 = i-1;

i=0; //Finding the length of new string, to replace

while(str3[i]!='\0')

{

i++;

}

len3 = i-1;

for(i=0;i<=len1;i++)

{

match = 1;

for(j=0;j<=len2;j++)

{

if(str2[j]!=str1[i+j])

{

match = 0;

break;

}

}

if(match){ //When a substring is found, copy remaining String to temporary String

for(k=0,j=i+len2+1;j<=len1;j++,k++){

temp[k] = str1[j];

}

temp[k] = '\0';

for(j=0;j<=len3;j++)

{

str1[i+j] = str3[j];

}

str1[i+j] = '\0';

for(p=0;temp[p]!='\0';p++)

{

str1[i+j+p]=temp[p];

}

str1[i+j+p]='\0';

len1 = len1-len2 +len3; //Update length value

i = i + j;

}

}

printf("\n\n\t OUTPUT IS : ");

puts(str1);

}