计算银行本利之和

int main(int argc, char *argv[]) {
    float rate,capital,deposit;
    int n;
    scanf("%f,%f,%d",&rate,&capital,&n);
    int i;
    float r=1;
    for(i=1;i<=n;i++){
        r=r*(1+rate);
    }
    deposit=capital*r;
    printf("%f",deposit);
}