C Programming Puzzles 3

51)
#include <stdio.h>
main()
{
        int i = 3,j;
        j = add(++i);
        printf("i = %d *p= %d\n", i, j);
}

add(ii)
        int ii;
{
        ii++;
        printf("ii = %d\n", ii);
}

52)
#include <stdio.h>
#define DEBUG(args) (printf("DEBUG: "), printf args)

main()
{
        int n = 0,i = 0 ;
        printf("%d\n", n);
        if(n != 0) DEBUG(("n is %d\n", n));
        DEBUG(("%d",i));

}

53)
#include <stdio.h>
main()
{
        printf("hello");
        fork();
}

54)
#include <stdio.h>
#include<malloc.h>
#include<string.h>
main()
{
        char *s2, *s1 ;
//      s1 = malloc(sizeof(char) * 1000);
        s1 = "Hello, ";
//      s2 = malloc(sizeof(char) * 10);
        s2 = "world!";
        strcat(s1, s2);
        printf("%s", s2);
}

55)
#include <stdio.h>
char*s="char*s=%c%s%c;main(){printf(s,34,s,34);}";
main()
{
        printf(s,34,s,34);
}

56)

#include <stdio.h>
#include<string.h>
main()
{
        char *s1 = "alpha", *s2 = "alpha";
        if(!strcmp(s1,s2)) printf("yes\n");
}

57)
#include <stdio.h>
#define DEBUG(args) (printf("DEBUG: "), printf args)

main()
{
        int n = 10;
        if(n != 0) DEBUG(("n is %d\n", n));

}

58)
#include <stdio.h>
main()
{
        int i;
        struct
        {
                int left,y;
        }a;
        printf("%5d\n",a[i].left);
}

59)
#include <stdio.h>
main()
{
        char c1,c2,c3;
        c1 = getc(stdin);
        putc(c1,stdout);
//      c2 = getche();
//      putc(c2,stdout);
        c3 = getchar();
        putc(c3,stdout);
}

60)
#include <stdio.h>
#include<malloc.h>
struct test{
        int f;
};

struct test* f(struct test * (*fPtr)() )
{
        struct test *ptr = (struct test*) malloc(sizeof(struct test));
        return ptr;
}
main()
{
        f(f)->f;
}

61)
#include <stdio.h>
void print_in_reverse( char *str )
{
        if( *str == '\0' )
                return;

        print_in_reverse(str+1);

        printf( "%c" , *str );
}
main()
{
        print_in_reverse( "char *str" );
}

62)
#include <stdio.h>
#include<math.h>
//#define sqrt(x) (( x < 0) ? sqrt(-x) : sqrt(x))
main()
{
        int y;
        y = sqrt(-9);
        printf("%d",y);
}

63)
#include <stdio.h>
#define MAXI 100
main(){
        int done,i,x=6;
        done=i=0;
        for(i = 0; (i< MAXI) && (x/=2)>1; i++)
                done++;
        printf("%d %d\n",i,done);
}

64)
#include <stdio.h>
main()
{

        char    as[] = "\\0\0";

        int     i = 0;
        do{
                switch( as[i++]){
                        case '\\' : printf("A");
                                    break;
                        case 0   : printf("B");
                                   break;
                        default : printf("C");
                                  break;
                }
        }
        while(i<3);
}

65)
#include <stdio.h>
#define MAXI 100
main(){
        int done,i,x=6;
        done=i=0;
        while (i < MAXI && !done){
                if ((x/=2)>1){ i++; continue;}
                done++;
        }
        printf("%d %d\n",i,done);
}

66)
#include <stdio.h>
main()
{
        struct emp
        {       char name[20];
                int age;
                float sal;
        };
        struct emp e = {"Tiger"};
        printf("\n%d %f",e.age,e.sal);
}

67)
#include <stdio.h>
main()
{
        char str[] = "Taj is 2 miles away";
        int i;
        for(i=0;i<19;++i)
                if(isalpha(str[i]))printf("%c",toupper(str[i]));
}

68)
#include <stdio.h>
main()
{
        int c;

        while((c=getchar()) != 0){
                printf("%c",c);
        }
}

69)
#include <stdio.h>
f( )
{
        printf("I am f()");
}
extern f1();
main()
{
        int i=10;
        f1(i);
}

f1(int i )
{
        printf("the i value is %d",i);
        f();
}

70)
#include <stdio.h>
#define abs(x) x>0?x:-x
#define mabs(x) (((x)>=0)?(x):-(x))
int kabs(int);
main()
{
        printf("\n%d   %d",abs(10)+1,abs(-10)+1);
        printf("\n%d   %d",mabs(10)+1,mabs(-10)+1);
        printf("\n%d   %d\n",kabs(10)+1,kabs(-10)+1);
}
int kabs(int n)
{
        return(n>0? n: -n);

}

71)

#include <stdio.h>
        unsigned char
f(unsigned n)
{
        static const unsigned char table[64] = {
                0, 0, 0, 9, 0, 0, 10, 1, 0, 0, 0, 0, 0, 11, 2, 21, 7, 
                0,0, 0, 0, 0, 0,15, 0, 0, 12, 0, 17, 3, 22, 27,32, 8,
                0, 0,0, 0, 0, 20, 6, 0, 0, 14,0, 0, 16, 26,31, 0, 0, 
                19, 5, 13,0, 25, 30, 18, 4, 24, 29, 23, 28, 0
        };
        return table[((n & -n) * 0x1d0d73df) >> 26];
}
main()
{
        printf("%c",f(8));
}

72)
#include <stdio.h>
int myfunc(char *str)
{
        char *ptr =str;
        while(*ptr++);
        return ptr-str-1;
}
main()
{
        printf("length is %d", myfunc("DESIS"));
}

73)
#include <stdio.h>
struct _tag
{
        int i;
        union
        {
                int a;
                int b;
        }c;
} a;

main()
{
        a.c.a=10;
        printf("test %d\n",a.c.b);
}

74)
#include <stdio.h>
main()
{
        int a=10,b;
        b=a>=5?100:200;
        printf("%d\n",b);
}

75)
#include <stdio.h>
main()
{
        int a;

        a = (1,45,012);

        printf("%d", a);
}