C convert char to int

Turn a char into an int in c

int x = character - '0';

   strcpy(str, "98993489");
   val = atoi(str);
   printf("String value = %s, Int value = %d\n", str, val);

int i;
char c = 'A'; 
i = (int)c;

int i = (int)(c - '0');

#include <sstream>

using namespace std;

int main()
{
    stringstream str;
    
    str << "1";

    double x;
    str >> x;
}

-5

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