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#include <stdio.h>
 
int main(void) {
	leftBitCount(-1);
}
 
void leftBitCount(int x) {
  int b;
  int c;
  int s;
  int a = 0;
  a = ~x;
  a = a | (a >> 1);
  a = a | (a >> 2);
  a = a | (a >> 4);
  a = a | (a >> 8);
  a = a | (a >> 16);
  a = ~a;
  b = 0x11 | (0x11 << 8);
  c = b | (b << 16);
  s = a & c;
  showBits(b);
  showBits(c);
  showBits(s);
}
 
void showBits(unsigned int w) {
   int arr[32];
   for (int i = 0; i < sizeof(w) * 8; i++) {
      if (w & 0x1) arr[i] = 1;
      else arr[i] = 0;
      w = w >> 1;
   }
 
   for (int i = 31; i >= 0; i--) {
      if ((i+1) % 4 == 0) printf(" ");
      printf("%d", arr[i]);
   }
   printf("\n");
}
 

prog.c: In function 'main':
prog.c:4:2: warning: implicit declaration of function 'leftBitCount' [-Wimplicit-function-declaration]
  leftBitCount(-1);
  ^
prog.c: At top level:
prog.c:7:6: warning: conflicting types for 'leftBitCount'
 void leftBitCount(int x) {
      ^
prog.c:4:2: note: previous implicit declaration of 'leftBitCount' was here
  leftBitCount(-1);
  ^
prog.c: In function 'leftBitCount':
prog.c:22:3: warning: implicit declaration of function 'showBits' [-Wimplicit-function-declaration]
   showBits(b);
   ^
prog.c: At top level:
prog.c:27:6: warning: conflicting types for 'showBits'
 void showBits(unsigned int w) {
      ^
prog.c:22:3: note: previous implicit declaration of 'showBits' was here
   showBits(b);
   ^
prog.c: In function 'showBits':
prog.c:29:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int i = 0; i < sizeof(w) * 8; i++) {
    ^
prog.c:29:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
prog.c:35:13: error: redefinition of 'i'
    for (int i = 31; i >= 0; i--) {
             ^
prog.c:29:13: note: previous definition of 'i' was here
    for (int i = 0; i < sizeof(w) * 8; i++) {
             ^
prog.c:35:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int i = 31; i >= 0; i--) {
    ^
prog.c: In function 'main':
prog.c:5:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty