printf
#include <stdio.h>
main()
{
    int num_tacos;
    float price_of_taco;
    num_tacos = 30;   
    price_of_taco = 1.45;
    printf("The number of tacos is %d\n", num_tacos);
    printf("The price of a taco is %f\n", price_of_taco);
}
% a.out
The number of tacos is 30
The price of a taco is 1.450000