how can I convert character to integer number

Question

How could I change an array of character (string) to an integer number without using any ready function (ex atoi();) for example :-

 char a[5]=\'4534\';
         


        

Answer 1

You can go like this

It's working

#include 
#include 
#include 

int main()
{

  char a[5] = "4534";

  int converted = 0;

  int arraysize = strlen(a);

  int i = 0;
  for (i = 0; i < arraysize ; i++)
  {
    converted = converted *10 + a[i] - '0';
  }

  printf("converted= %d", converted);   

  return 0;
}