#include<stdio.h>
#include<conio.h>
void main()
{
char a[100],b[100],c[100],d[100];
int i,j,k,l1,l2,l3,m,count=-1;
clrscr();
printf("\t\t\t REPLACE OF STRING ");
printf("\n\t\t\t ********************");
printf("\n\n\tINPUT");
printf("\n\t*******");
printf("\n\nEnter the first String:");
scanf("%[a-z ]s",a);
printf("\nEnter the substring:");
scanf("%s",b);
printf("\nEnter the replace string:");
scanf("%s",c);
printf("\n\n\tOUTPUT");
printf("\n\t*******");
for(i=0;a[i]!='\0';i++)
l1=i;
for(i=0;b[i]!='\0';i++)
l2=i;
for(i=0;c[i]!='\0';i++)
l3=i;
for(i=0;a[i]!='\0';i++)
d[i]=a[i];
d[i]='\0';
if(l1>=l2)
{
do
{
for(i=0,j=0;a[i]!='\0' && b[j]!='\0';i++ )
{
if(a[i]==b[j])
{
count++;
j++;
}
else
{
count=-1;
if(j>0)
i--;
j=0;
}
}
m=i;
if(count==l2)
{
i=i-j;
for(k=0;c[k]!='\0';i++,k++)
a[i]=c[k];
if(l2!=l3)
{
for( ;d[m]!='\0';m++,i++)
{
a[i]=d[m];
}
}
//a[i]='\0';
//printf("\nReplaced string:%s",a);
}
else
break;
//printf("\nThe substring is not there");
}while(a[i]!='\0');
printf("\nReplaced string:%s",a);
}
getch();
}
C Program to Replace a STRING.
