Press enter to continue after yes/no in C
while (getchar() != 'n');

int main (int argc, const char * argv[]) {
    printf("Would you like to continue? Please press y or n.n");

    if(getchar() == 'y'){
        printf("You pressed yes! Continuing...");
    }
    else{
        printf("Pressed no instead of yes.");
    }
        //flush commands go here
    printf("nPress ENTER to continue...");
    if(getchar()=='n'){
        printf("nGood work!");
    }else{
        printf("Didn't hit ENTER...");

    return 0;
}

1. Single character input
2. 3 character String

#include<stdio.h>
int main()
{
char ch[3];
char c;
int i=0;
while(((c=getchar())!='n')){
        ch[i]=c;
        i++;
}
ch[i]='';
if (i==1)
        if (ch[0]=='Y'||ch[0]=='y')
                printf("OK");
        else
                printf("Not OK");
else if(i==3)
        if (strcmp(ch,"Yes")==0)
                printf("OK");
        else
                printf("Not OK");
else
        printf("NOT OK");
return 0;
}

int c=getchar();
if(c=='y' || c=='Y')
....