velocidade.c

#include <stdio.h>

struct speed {
    int x;
    int y;
};

void aumenta(struct speed *speed);

void aumenta(struct speed *speed){
    speed->x += 10;
    speed->y += 10;
}

int main(int argc, char *argv[])
{
    struct speed speed = {10,4};
    /* struct speed speed = {.x=10,.y=3}; */
    printf("Velocidade X=%d, Y=%d\n", speed.x, speed.y);
    aumenta(&speed);
    printf("Velocidade X=%d, Y=%d\n", speed.x, speed.y);

    return 0;
}