printf doesn't behave as I imagine it ought to

Question

If I run the code below it won't display the whole answer (last printf("") is the answer). I would like to know why it doesn't display the whole answer. Does anyone know this problem?

#include <stdio.h>

int main()
{
    int M,T,P,K,H;
    printf("Teekonna pikkus:\n");
    scanf("%u", &P);
    printf("Tarbitud k\u00FCtuse kogus:\n");
    scanf("%u", &K);
    printf("K\u00FCtuse liitri hind:\n");
    scanf("%u", &H);
    T = K/(P/100);
    M = K*H;
    printf("Olete s\u00F5itnud %u", P," kilomeetrit ning kulutanud %u", K," liitrit kütust. Teie auto k\u00FCtusekulu oli %u", T," liitrit 100 kilomeetri kohta. S\u00F5idu maksumus oli %u", M," eurot.");
    while(1);
}

Answer 1

The printf has the following syntax:

int printf ( const char * format, ... );

the first parameter is the format and all the others variables can substitute placeholders present in the format.

You should write:

printf("Olete s\u00F5itnud %u kilomeetrit ning kulutanud %u liitrit kütust. Teie auto k\u00FCtusekulu oli %u liitrit 100 kilomeetri kohta. S\u00F5idu maksumus oli %u eurot.", P, K, T, M);

Answer 2

That isn't the way printf works. Put all the arguments after the format string.

printf("Olete s\u00F5itnud %u kilomeetrit ning kulutanud %u liitrit kütust. Teie auto k\u00FCtusekulu oli %u liitrit 100 kilomeetri kohta. S\u00F5idu maksumus oli %u" eurot.", P, K, T, M);

Answer 3

There are 2 problems in the code:

• printf() should be used as: printf("P: %d - T: %d\n", P, T);

• but there is also the possibility of a division by zero:

T = K/(P/100);

P is an integer, and if P/100 becomes small enough, it will be rounded off to 0. Then K/0 (zero) will create a problem.

So, those values should be checked before division. And it might be better to use (or convert to) float or double for some variables.

Answer 4

printf() output is based on the first string parameter (formatting string), replacing the special % characters ("formatting specifier) in it with the additional parameters following the string.

So it displays only what you've asked to display, because you have only %u (unsigned int, which corresponds to P). The remaining parameters are ignored, as no other formatting specifier can be found in the formatting string

You should concatenate all the formatting strings:

  printf (""Olete s\u00F5itnud %u  kilomeetrit ning kulutanud %u ...%u...%u...", P, K, T, M);