C

turn a char into an int in c

int x = character - '0'; 

c convert char to int

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

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");

int to char in c

c = i +'0';

char to int in c

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

char to int in c

char c = '5';
int x = c - '0';

c char to int

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