Sigma(C_C++)-Riemann's

#include <stdio.h>


float persistance;
float initial;
float rate;
float x;
float result_print;

int main(void)
{
    printf("please aeneter your numbers:\n");
    printf(" N ");
    scanf_s("%f", &persistance);
    printf("\n===");
    printf("\n>>  r");
    scanf_s("%f", &rate);
    printf("\n===");
    printf("\ni=?");
    scanf_s("%f", &initial);
    printf("\nplease enter your equation numnber: ");
    scanf_s("%f", &x);
    result_print = x;
    for (size_t i = initial; i < persistance; i += rate)
    {
        result_print += i;
        //Sleep(5);
        printf("\nlog: %3d, %f", i, result_print);
    }
    printf("\nstart: %f \nrate: %.2f \nend: %f \nresult: %.2f", initial, rate, persistance, result_print);
}