Problem 74: Mem Address

Take an integer variable named X and assign X = 5. Now print its memory address like the following output-

Memory Address of X is : XXXXXX

Code: 
 

    #include<stdio.h> 
 
int main()
{
    int x;
    x=5;
    printf("Memory Address of X is : %d\n",&x);

return 0;
}
Problem 75: Address

Take two pointer variables of integer type named pX and pY. Now take another two variables of integer data type named X and Y. Assign X = 100 and Y = 200. Assign the address of X to pX and address of Y to pY. Now print the values of X and Y using pX and pY.

Code: 
 

    #include<stdio.h> 
 
int main()
{
    int *px,*py;
    int X,Y;
    X=100;
    Y=200;
    px=&X;
    py=&Y;
    printf("%d\n%d\n",*px,*py);


return 0;
}
Problem 76: Pointer Test I

Write the output of the following code without compiling-

#include<stdio.h>

int main(){

int a[]={5,10,15,20,25};

int *pA;

pA = &a[2];

printf(“%d %d”,*pA, *(pA+2));

return 0;

}

Code: 
 

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

   int a[]={5,10,15,20,25};

   int *pA;

   pA = &a[2];

   printf("%d %d",*pA, *(pA+2));

return 0;

}
Problem 77: Array Address

Is there any error in the following program? If not what will be the output-

#include<stdio.h>

int main(){

int i;

double *pA;

double a[]={5,10,15,20,25};

pA = a;

for(i = 0; i < 5; i++){

printf(“%.2lf “,*(pA+i));

}

return 0;

}

Code: 
 

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

   int i;

   double *pA;

   double a[]={5,10,15,20,25};

   pA = a;

   for(i = 0; i < 5; i++){

       printf("%.2lf ",*(pA+i));

   }

return 0;

}
Problem 78: Pointer^2

Take an integer variable named VAR and assign VAR = 500. Take a pointer variable named *ptr of integer type and assign the address of VAR to ptr. Then take another pointer to pointer variable named **pptr of integer type and assign the address of pointer variable ptr to pptr. Now print the value of VAR using the VAR , ptr and pptr respectively in three different lines.

Memory Address of X is : XXXXXX

Code: 
 

    #include<stdio.h> 
 
int main(){
    int VAR;
    VAR=500;
    int *ptr;
    ptr=&VAR;
    int **pptr;
    pptr=ptr;

    printf("%d\n",VAR);
    printf("%d\n",*ptr);
    printf("%d\n",*pptr);

return 0;

}
Problem 79: Pointer Test III

Write down the output of the following program without running-

#include <stdio.h>

int main()

{

char *str = “Bangladesh”;

printf(“%c %c %c”,*str, *(str + 3), *(str + 4));

return(0);

}

Memory Address of X is : XXXXXX

Code: 
 

    #include<stdio.h> 
 
int main()
{
  char *str = "Bangladesh";
  printf("%c %c %c",*str, *(str + 3), *(str + 4));
  return(0);
}
Problem 80: Array of String

Take an array of string named fruitNames and store four fruit names (“Mango”, “Jack-fruit”, “Banana”, “Litchi”). Now iterate the array using loop and print the names of the fruits each in a separate line.

Code: 
 

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

char *fruitNames[4] = {"Mango","Jack-fruit","Banana","Litchi"};
char *(*ptr)[4] = &fruitNames;

for(i=0;i<4;i++)
    printf("%s\n",(*ptr)[i]);

return 0;
}