Thread: Scanf/Fgets and input issues

Hello everyone.

I was wondering why I have this really tedious problem where the terminal basically does not ask the user for input.

The code down here is for a program that simply stores basic information about N workers, via a structure. As you can see from the picture I uploaded down here, there's no way I can insert a worker's surname.

Could you help me find my mistake?

Code:

 

#include <stdio.h>
#define N 100
int main (void)
{
    typedef struct {
          char surname[40];
          int years_worked;
          float salary;
            } worker;
    worker ARRAY_WORKERS[N];
    for (int i = 0; i < N; i ++)
    {
        char ch;
        printf("Do you wish to enter data for a new worker ?\n");
        printf("0 to exit; 1 to continue.\n");
//I am aware the program continues for any other key other than 0 :)
        if ( (ch = getchar()) == '0')
            break;
        printf("Enter a surname for the %d° worker: ", i + 1);
        fgets(ARRAY_WORKERS[i].surname, 40, stdin);
        printf("Enter the number of years worked: ");
        scanf("%d", &ARRAY_WORKERS[i].years_worked);
        printf("Enter the monthly salary (ex. 1350.55): ");
        scanf("%f", &ARRAY_WORKERS[i].salary);
    }
    return 0;
}

I tried using scanf instead of fgets, but the program works (does not) in a similar fashion. Basically I manage to insert the worker's surname, but the program then stops asking me if I want to stop. (Does not take input for ch).

The short answer is don't mix fgets with scanf.

Code:

        char buff[BUFSIZ];
        printf("Do you wish to enter data for a new worker ?\n");
        printf("0 to exit; 1 to continue.\n");
        fgets(buff, BUSIZ, stdin);
        if ( buff[0] == '0')
            break;
        printf("Enter a surname for the %d° worker: ", i + 1);
        fgets(ARRAY_WORKERS[i].surname, 40, stdin);
        printf("Enter the number of years worked: ");
        fgets(buff, BUSIZ, stdin);
        sscanf(buff,"%d", &ARRAY_WORKERS[i].years_worked);
        fgets(buff, BUSIZ, stdin);
        printf("Enter the monthly salary (ex. 1350.55): ");
        sscanf(buff,"%f", &ARRAY_WORKERS[i].salary);

Ideally, do this

Code:

        if ( fgets(buff, BUSIZ, stdin) != NULL ) {
                if ( sscanf(buff,"%d", &ARRAY_WORKERS[i].years_worked) == 1 ) {

The respective else clauses being
- error in conversion
- EOF or error in reading from stdin