#include <stdio.h>
#include <conio.h>
    void main()
    {
        char a[100],b[10],t[20][20],c[10];
        int i=0,n=0,w=1,k=0;
        clrscr();
        printf("\n Enter The String : ");
        scanf("%[^\n]",a);
        printf("\n Enter The Word Need To Replace : ");
        scanf("%s",b);
        printf("\nEnter The New Word : ");
        scanf("%s",c);
        while(a[i]!='\0')
        {
            t[k][n]=a[i];
            if(a[i]==' ')
            {
                t[k][n]='\0';
                //printf("\n %s",t);
                n=-1;
                k++;
             }
            i++;
            n++;
        }
        printf("\n the replaced string is  : \t");
        for(i=0;i<k+1;i++)
        {
            if(strcmp(t[i],b)==0)
                strcpy(t[i],c);
            printf(" %s ",t[i]);
        }
        getch();
    }

/*
     ******
     OUTPUT
     ******


 Enter The String : This is a sample program

 Enter The Word Need To Replace : sample

Enter The New Word : demo

The replaced string is  : This is a demo program
*/