Question

i am a learner of ‘C’ and written a code, but after i compile it, shows a Debug Error message, here is the code:

#include<stdio.h>
void main()
{
    int n,i=1;
    char c;
    printf("Enter Charecter:\t");
    scanf("%s",&c);
    printf("Repeat Time\t");
    scanf("%d",&n);
    n=n;
    while (i <= n)
    {
        printf("%c",c);
        i++;
    }
}

Pls tell me why this happens and how to solve it

Answer 1

I’m not sure you understood the answer to your other question: Odd loop does not work using %c

These format specifiers are each used for a specific job.

If you want to get a:

• character from stdin use %c.
• string (a bunch of characters) use %s.
• integer use %d.

This code:

char c;
printf("Enter Character:\t");
scanf("%c",&c);

Will read 1 character from stdin and will leave a newline ('\n') character there. So let’s say the user entered the letter A in the stdin buffer you have:

A\n

The scanf() will pull 'A' and store it in your char c and will leave the newline character. Next it will ask for your int and the user might input 5. stdin now has:

\n5

The scanf() will take 5 and place it in int n. If you want to consume that ‘\n’ there are a number of options, one would be:

char c;
printf("Enter Character:\t");
scanf("%c",&c);  // This gets the 'A' and stores it in c
getchar();       // This gets the \n and trashes it