CODEWITHSUNDEEP
c
M K Sundaram
M K Sundaram

Reputation: 47

Unexpected output while reading string from a keyboard

This program is returning something which I'm not able to comprehend. Attached is the screenshot of the O/P simple program to find number of spaces, tabs, etc.

What am I missing?

#include <stdio.h>
#include <string.h>

int main() {
    int count[] = { 0, 0, 0 }; /* 0 is spaces, 1 is tabs and 2 for newline. */
    int string;
    
    printf("Enter the paragraph: \n");
    while ((string = getchar()) != EOF) {
        if (string == ' ')
            count[0]++;
        else if (string == '\t')
            count[1]++;
        else if (string == '\n')
            count[2]++;
    }
    printf("There are %d Spaces.\n", count[0]);
    printf("There are %d Tabs.\n", count[1]);
    printf("There are %d Newlines.\n", count[2]);
    return 0;
}

enter image description here

Upvotes: 1

Views: 66

Answers (2)

chqrlie
chqrlie

Reputation: 144969

From the screenshot it appears you typed Ctrl-Z to signal the end of file to your program. While this works in legacy systems such as MS/DOS and the Windows terminals, this key combination has a different meaning on unix systems such as linux: it causes the current process to be suspended by its the running shell parent. The process can be resumed later with the fg command.

To signal the end on file on this system, you should type Ctrl-D instead.

Your program should produce the expected result then. The code seems OK, albeit it is quite confusing to name string an int variable that gets a single byte from getchar(). Such a variable is usually named c.

Upvotes: 2

Matteo Pinna
Matteo Pinna

Reputation: 409

If you want to send an EOF in order to stop reading you should use CTRL+D.

Upvotes: 1

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