intplay.c

#include <stdio.h> // definition of printf()
#include <stdint.h> // definitions of uint32_t and other types

void printUInt(uint32_t val) {
    unsigned char binval[33];

    for (unsigned i=0; i<32; i++) {
        binval[i] = (val & (1<<(31-i))) ? '1' : '0';
    }

    // zero-terminate
    binval[32] = 0;

    printf("] hex 0x%08X, bin %s, dec %u\n", val, binval, val);
}

int main() {
    uint32_t val;
    
    // print 0x12
    val = 0x12;
    printUInt(val);

    // print 0x1234
    val = 0x1234;
    printUInt(val);

    // compose 0x1234 from two separate bytes
    val = (0x12 << 8) | 0x34;
    printUInt(val);

    // compose 0x1234 from two separate bytes using + instead of bit or
    val = (0x12 << 8) + 0x34;
    printUInt(val);

    // compose full int
    val = (0xAA << 24) + (0xBB << 16) + (0xCC << 8) + 0xDD;
    printUInt(val);

    return 0;
}