Question

Problem:
Create an algorithm for a program that simulates a police radar gun. The algorithm should read an automobile speed (in km/h) and print the message “Speeding” if the speed exceeds 59kmh. The algorithm should then also calculate the appropriate fine, $80 for 1-10kmh above the limit, $150 for 11-30kmh above the limit, $500 for 31kmh or more above the limit. Use the space below.

My solutions:

#include <stdio.h>
int main()
{
    int speed = 0;
    int limit = 59;

    /*Get automobile speed from user*/
    printf("Please enter the speed: ");
    scanf("%d%*c", &speed);
    /* Based on the speed, generates the corresponding fine*/
    if (speed > limit)
       {
        printf("Speeding");
        if((speed - limit) <= 10)
            printf("Fine: $80");
        else
            if((speed - limit) >= 11 & (speed - limit) <= 30)
                printf("Fine: $150");
            else
                if((speed - limit) >= 31)
                    printf("Fine: $500");
       }
    else
        printf("The automobile is not speeding");
    return (0);
}

The problem here is that it won’t print out the message “Speeding”.
Can anyone give me a hand?

Answer 1

printf is buffered when writing to stdout. Use fflush(stdout) after your printf functions, or add a new line, ie printf("Speeding\n");

You can also disable buffering on the stdout stream by using setbuf(stdout, NULL);