c pointer to struct as parameter

#include <stdio.h>
#include <stdlib.h>


typedef struct{
    float v1;
    float v2;
}testas;

testas tst;

int testF(testas *stst)
{

    stst->v1+=1.0f;
    stst->v2+=1.0f;

    return 0;
}

int main (int argc, char **argv)
{

    tst.v1=0.1f;
    tst.v2=1.1f;

    printf("v1 before: %f\n",tst.v1);
    printf("v2 before: %f\n",tst.v2);

    testF(&tst);

    printf("v1 after: %f\n",tst.v1);
    printf("v2 after: %f\n",tst.v2);

return 0;
}

/*
output:

v1 before: 0.100000
v2 before: 1.100000
v1 after: 1.100000
v2 after: 2.100000

*/