c Pointer basic Basics

C   Pointer Basics Technical Questions

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I am sabari, computer science engineer. Here I would like to Share some of my Interview preparation Question you may worked out (compile and run) from these you will come to know some interesting facts on C Pointer Basics,

Basics

Pointer is a variable that holds another variable’s address.

Pointer Example

#include

#include

int main()

{

    int *p,a;

    float *p1,b;

    p=&a;

    p1=&b;

    a=10;

    //clrscr();

    printf("a=%d\n",a);

    printf("a=%d\n",*p);

    /* pointer size*/

    printf("integer pointer size is %d\n",sizeof(p));

    printf("integer size is %d\n",sizeof(a));

    printf("integer pointer size is %d\n",sizeof(p1));

    printf("Float size is %d\n",sizeof(b));

    //printf("welcome");

    return 0;

}

// Function Pointer

#include

#include

void main()

{

int *p; //pointer for a function

int *f();//function  pointer

int a,b,c;

printf("Enter the three numbers:");

scanf("%d %d %d",&a,&b,&c);

p=f(a,b,c);

clrscr();

//printf("a address is :%u",p);

printf("VALUE OF BIG :%d",*p);

getch();

}

int *f(int x,int y,int z)

{

  static int a;

  a=(x

 // a=a*b;

 // printf("a address is :%u",a);

return(&a);

}

String copy

#include

#include

char source1[25],source2[25];

int main()

{

char *sp1,*sp2;

int r;

printf("welcome TO strcompare:\n Enter the sourc1");

scanf("%s",source1);

sp1= source1;

sp2= source2;

while(*sp1)

{

    *sp2=*sp1;

    sp1++;

    sp2++;

}

printf("the copied string is:%s",source2);

return 0;

}

//String compare

#include

#include

char source1[25],source2[25];

int main()

{

char *sp1,*sp2;

int r,c;

clrscr();

printf("welcome TO strcompare:\n Enter the sourc1");

scanf("%s",&source1);

printf("\n Enter the sourc1");

scanf("%s",&source2);

sp1= source1;

sp2= source2;

while(*sp1!='\o')

{

    if(*sp2==*sp1)

    {

    sp1++;

    sp2++;

     c=1;

    }

   else

  {

  printf("the string is not equl");

  *sp1='\o';

  }

  }

  if(c==1)

  {

     printf("the  string is equal");

     }

return 0;

}

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