Homework 2 Code, C (gcc)

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//gcc 5.4.0

#include  <stdio.h>

int DecimalToBinary(int decimal, char *binary) {

unsigned int temp = decimal;
    int i;
    for (i=0; i<32; i++) {
    
       //ASCII code for '0' is 48 and for '1' is 49
       
       //the bit we calculate in this loop is Least Significant Bit (LSB), so the index is 31-i
       binary[31-i] = 48+ temp % 2;
       
       //dividing by 2, simply shifts the number to right and allows us to process the next bit 
       temp = temp / 2;
       }
       
    //an end is put at the end of binary string. Again this is not a number, but an array of '0's and '1's   
    binary [32] = 0;
 }

int main(void)
{
    int k;
    scanf("%d", &k);
    
    
   char binary[33];
   DecimalToBinary(k, binary);
   
    int temp;
    int temp2;
    int temp3;
    int temp4;
    temp = k | 0x000000f0; //#1(a) in homework
    temp2 = k | 0x00000009; //#1(b) in homework
    temp3 = k & 0x00ffffff; //#1(c) in homework
    temp4 = k & 0xffffffff; //#1(d) in homework
    temp4 = k | 0x0000000a;
    if ((k|0x00000008)&(k&0xffffffef)) //#1(e) in homework NOT FINISHED
    {
        printf("true\n");
    }
    else
    {
        printf("false\n");
    }
    
    DecimalToBinary(k, binary);
    printf ("Binary: %s\n", binary);
    DecimalToBinary(temp, binary);
    printf ("Binary: %s\n", binary);
    DecimalToBinary(temp2, binary);
    printf ("Binary: %s\n", binary);
    DecimalToBinary(temp3, binary);
    printf ("Binary: %s\n", binary);
    DecimalToBinary(temp4, binary);
    printf ("Binary: %s\n", binary);
    
    char char_in; //#1(f) on homework
    char tempChar;
    scanf("%c",&char_in);
    if ('a'<=char_in && char_in<='z')
    {
        tempChar = char_in - 32;
        printf("%c",tempChar);
    } 
    
}

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Compilation time: 0.12 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,35 sec