2. Develop a Program in C for the following operations on Strings.
a. Read a main String (STR), a Pattern String (PAT) and a Replace String (REP).
b. Perform Pattern Matching Operation: Find and Replace all occurrences of PAT in STR with REP if PAT exists in STR. Report suitable messages in case PAT does not exist in STR.
#include<stdio.h>
char str[50], pat[20], rep[20], res[50];
int c = 0, m = 0, i = 0, j = 0, k, flag = 0;
void stringmatch()
{
while (str[c] != '\0')
{
if (str[m] == pat[i])
{
i++;
m++;
if (pat[i] == '\0')
{
flag = 1;
for (k = 0; rep[k] != '\0'; k++, j++)
{
res[j] = rep[k];
}
i = 0;
c = m;
}
}
else
{
res[j] = str[c];
j++;
c++;
m = c;
i = 0;
}
}
res[j] = '\0';
}
void main()
{
printf("Enter the main string:");
gets(str);
printf("\nEnter the pat string:");
gets(pat);
printf("\nEnter the replace string:");
gets(rep);
printf("\nThe string before pattern match is:\n %s", str);
stringmatch();
if (flag == 1)
printf("\nThe string after pattern match and replace is: \n %s ", res);
else
printf("\nPattern string is not found");
}OUTPUT:
**************************OUTPUT 1*******************************
Enter the main string:Designed by vtucode
Enter the pat string:vtucode
Enter the replace string:Braham
The string before pattern match is:
Designed by vtucode
The string after pattern match and replace is:
Designed by Braham
**************************OUTPUT 2*******************************
Enter the main string:Designed by Developer
Enter the pat string:vtucode
Enter the replace string:Braham
The string before pattern match is:
Designed by Developer
Pattern string is not found