The printf doesn't give output until I type a letter and press enter

Question

#include <stdio.h>
#include <math.h>

int main() {
    float g1, g2, c1, c2, dismul, cadd, csub, dis;

    printf("Enter the latitudes of the places (L1 and L2): ");
    scanf("%f %f", &c1 ,&c2);
    printf("Enter the longitudes of the places (G1 and G2): ");
    scanf("%f %f ", &g1, &g2);
    cadd = cos(c1 + c2);
    csub = cos(g2-g1);
    dismul = cadd * csub;
    dis = 3963 * acos(dismul);
    printf("The distance between the places is:%f\n", dis);
    return 0;
}

I wrote this code to give distance between two points but when I run it, it does not give the last printf until I type any letter and press enter.

Please don't tag unrelated languages! C# is sufficiently different from C that the first couple of lines of code would result in a compiler error, and methods like `printf` and `scanf` don't exist, even with an import. — ProgrammingLlama, Dec 23 '20 at 10:08

score 5 · Accepted Answer · answered Dec 23 '20 at 10:12

5

as already pointed out in comments, on line 9 of your code ( scanf("%f %f ",&g1,&g2);)

There is an extra space after the second "%f", so scanf() is expecting to read a whitespace after a floating point character.

replace it with

scanf("%f %f",&g1,&g2);

to fix it.

answered Dec 23 '20 at 10:12

Arsenic

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It helped a lot. Thank you – Meet Singh Dec 23 '20 at 10:15
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@MeetSingh I don't believe you. Double check again, you must have done wrong something. – Jabberwocky Dec 23 '20 at 10:16
@MeetSingh another possibility is that your c library is broken, but I don't believe this either – Jabberwocky Dec 23 '20 at 10:17
I tested it on my machine with input `1 2 3 4` for which I am getting final value as `8461.718750` – Arsenic Dec 23 '20 at 10:22

The printf doesn't give output until I type a letter and press enter

1 Answers1