从指针转换为不同大小的 integer [-Wpointer-to-int-cast]

Question

I keep getting these warnings

I want to calculate the image size in colors in (Mo) and in black and white in (Ko) so for this I'm using a parameters that are past in a terminal command which are (image length and width)

Here is my code

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

int main(int argc, char *argv[]) {
   
   float resultKo, resultMo;

   resultKo = ((int)argv[1] * (int)argv[2]) / (1024);
   resultMo = (((int)argv[1] * (int)argv[2])/(1024 * 1024))*3;

   printf("la taille de l'image en niveau de gris : %.2fko\n",resultKo);
   printf("la taille de l'image en couleur : %.2fMo", resultMo);
   return 0;
}

Answer 1

To convert a char* to an int in C, you don't cast the pointer. Instead you use atoi .