converting character to integer C code example

Example 1: char to int c++

int x = (int)character - 48;

Example 2: turn a char into an int in c

int x = character - '0';

Example 3: casting an int to a char in c

Use ASCII chart.
int i=65;
char ch;
ch= (char)i;
printf("Expected value of ch: A. This value is found by using a ASCII chart");