C Programming Puzzles 4

76)
#include <stdio.h>
#define MAXI 100
main(){
        int x=6,done,i;
        done=i=0;
        do
        {
                if((x/=2)>1)
                {i++; continue;}
                else
                        done++;
        }while ((i < MAXI) && !done);

        printf("%d %d\n",i,done);
}

77)
#include <stdio.h>
main()
{
        extern int i;
        i=20;
        printf("%d\n",sizeof(i));
}

78)
#include <stdio.h>
fun()
{
        printf("Yes\n");
}

#define fun()  printf("No\n")

main()
{
        fun();
        (fun)();
}

79)
#include <stdio.h>
main()
{
        int i = 1;
        switch(i) {
                printf("\nHello, ");
                case 1: printf("One, ");
                        i++;
                        break;
                case 2: printf("Two");
                        break;
        }
}

80)
#include <stdio.h>
#define DESHAWCURRENTDEBUGLEVEL 1
void main(void)
{
        int i = 10 ;
        int j = 15 ;

#ifdef DESHAWCURRENTDEBUGLEVEL
        printf("%d\n",i);
#else
        printf("%d\n",j);
#endif
}

81)
#include <stdio.h>
#define scanf "%s DE Shaw"
main()
{
        printf(scanf,scanf);
}

82)
#include <stdio.h>
main()
{
        char *p="abc";
        char *q="abc123";

        while(*p==*q)
        {
                printf("%c %c",*p,*q);
                p++;q++;
        }
}

83)
#include <stdio.h>
#define INTPTR int *
main()
{
        INTPTR pi, pj;
        int i,j;
        i=10;j=20;
        pi = &j;
        pj = &j;
        j++;
        i= *pi;
        printf("%d,",i);
        j++;
//      i= *pj;
        printf("%d",pj);
}

84)
#include <stdio.h>
#include<string.h>
main()
{
        char strp[] = "Never ever say no";
        char *chp, c='e';
        int i,j;
        chp = strrchr(strp, c);
        i = chp-strp;
        for(j=0;j<=i;j++)printf("%c",strp[j]);
}

85)
#include <stdio.h>
main()
{
        char str[] ="abcdef";
        printf("str is %s",str);
        str = "DESIS";
        printf("str is %s",str);
}

86)
#include <stdio.h>
main()
{
        int i = 10;
        printf(" %d %d %d \n", ++i, i++, ++i);
}

87)
#include <stdio.h>
#include<string.h>
main()
{
        char *str ="India pvt. ltd.";
        char *str1 = "DESIS";
        printf("str is %s",str);
        printf("str is %s",str1);
        strcpy(str,str1);
        printf("str is %s",str);
}

88)
#include <stdio.h>
#include<string.h>
main()
{
        char str[] ="DESIS India pvt. ltd.";
        const char *str1= str;
        strcpy(str1,"DESHAW");
        printf("str is %s",str);
}

89)
#include <stdio.h>
main()
{
        int i=4,j=2,k=0;
        char c1='a',c2='b';
        if(k==0)printf("k is zero\n");
        else if(j==2)printf("j is 2\n");
        else if(i==4)printf("i is 4\n");
        if(c1!='a')printf("c1 is not a\n");
        else if (c2=='a')printf("c2 is b");
        else printf("Hello\n");
}

90)
#include <stdio.h>
main()
{
        int a[3] = {1,2,3};
        int i= 2;
        printf("\n %d %d\n", a[i], i[a]);
}

91)
#include <stdio.h>
void fun(int, int*);
main()
{
        int j,i;
        int * intptr;
        printf("enter an integer\n");
        scanf("%d",&i);
        intptr = &j;
        j = i;
        printf("i and j are %d %d \n",i,j);
        fun(j,intptr);
        printf("i is:%d",i);
        printf("\n j is:%d",j);
}
void fun(int k, int *iptr)
{
        k++;
        (*iptr)++;
        return;
}

92)
#include <stdio.h>
main()
{
        int x;
        x = printf("%d\n",x=printf("%d\n",100));
        printf("%d\n",x);
}

93)
#include <stdio.h>
main()
{
        int i;
        char c;
        for (i=0;i<5;i++){
                scanf("%d",&c);
                printf("%d",i);
        }
}

94)
#include <stdio.h>
main()
{
        int x = 10,y=2,z;
        z=x/*y+y*/+y;
        printf("%d\n",z);
}

95)
#include <stdio.h>
main()
{
        int a[] = {0,1,2,3,4};
        int *p[] = {a,a+1,a+2,a+3,a+4};
        int **pp = p;

        printf("%d, %d, %d ", *pp-a, pp-p, **pp);
        pp++; pp++;;++pp;*++pp;
        printf("%d, %d, %d ", pp-p, *pp-a, **pp);
}

96)
#include <stdio.h>
#include<stdlib.h>
#include<ctype.h>
main()
{
        int *p, *c, i;
        i = 5;
        p = malloc(sizeof(i));
        printf("\n%d",*p);
        *p = 10;
        printf("\n%d  %d",i,*p);
        c = calloc(2,i);
        printf("\n%d\n",*c);
}

97)
#include <stdio.h>
main()
{
        char input[] = "SSSWILTECH1\1\1";
        int i, c;
        for ( i=2; (c=input[i])!='\0'; i++)
        {
                switch(c)
                {
                        case 'a': putchar ('i'); continue;
                        case '1': break;
                        case 1: while (( c = input[++i]) != '\1' && c!= '\0');
                        case 9: putchar('S');
                        case 'E': case 'L': continue;
                        default: putchar(c);continue;
                }
                putchar(' ');
        }
        putchar('\n');
}

98)
#include <stdio.h>
main()
{
        unsigned int k = 987 , i = 0;
        char trans[10];

        do
        {
                trans[i++]  = (k%16 > 9) ? (k%16 - 10 + 'a') : (k%16 - '0' );

        } while(k /= 16);

        for(i=0;i<10;i++)
                printf("%c", trans[i]);
}

99)
#include <stdio.h>

main()
{
        unsigned int k = 987 , i = 0;
        char trans[10];

        do {
                trans[i++]  = (k%16 > 9 ? k%16 - 10 + 'a' : k%16 - '0' );
                printf("%d %d\n",k,k%16);

        } while(k /= 16);

        printf("%s\n", trans);
}

100)
#include <stdio.h>
main()
{
        char *pk;
        const char* p;
        const char c = 'a';
        char c1='b';
        p=&c1;
        pk = &c;
        printf("%c %c",*pk,*p);
}