hex to ascii

#include <stdio.h>int main(void){    //dec    char a = 64;    char b[3];    unsigned int x;        //b = "64"    sprintf(b,"%d", a);    //x = 0x64, hex    sscanf(b, "%2x", &x);    printf("a = %d\t, x = %c\n", a, x);    return 0;}