Answer :
#include <stdio.h>
#include <string.h>
int main()
{
char b[100], i='a', ch='*';
int a;
printf("Please Enter any String : ");
scanf("%s",&b);
for (a=0;a<=strlen(b);a++)
{
if(b[a]==i)
{
b[a]=ch;
}
}
printf(" The Final String is %s ",b);
}
Output :
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