Question

1- Write a C program to add and subtract any two given integer numbers using pointers.  

2- Write a C program to find the factorial using a function and pointers.  

3- Write a C program to find the square of an Integer number using a function and pointers.  

4- Write a C program to find the area and perimeter of a rectangle using a function and pointers.  

5- Write a C program to find the larger of two integers numbers using a function returning pointer.

Answer 1

Following is the required code :

#include

int add( int* a, int* b ){
   return (*a)+(*b);  
}

int sub( int* a, int* b ){
   return (*a)-(*b);
}

int factorial( int* n ){
   int i = 1;
   int result = 1;
   for( i = 1; i <= (*n); i++ ){
       result = result*i;
   }
   return result;
}

int square( int* a ){
   return (*a)*(*a);
}

int perimeter( int* a, int* b ){
   return 2*(*a + *b);
}

int area( int* a, int* b ){
   return (*a)*(*b);
}

int larger( int* a, int* b ){
   if( (*a) < (*b) ){
       return *b;
   }
   return *a;
}

int main(){
   int a = 2;
   int b = 3;
   int c = add( &a , &b );
   printf("%d\n",c);
   c = sub( &a , &b );
   printf("%d\n",c);
   c = factorial( &b );
   printf("%d\n",c);
   c = square( &b );
   printf("%d\n",c);

   c = perimeter( &a , &b );
   printf("%d\n",c);
   c = area( &a , &b );
   printf("%d\n",c);
   c = larger( &a , &b );
   printf("%d\n",c);

}

Answer 2

#include #define MAX_SIZE 100 // Maximum string size int main() { char str[MAX_SIZE]; int i; /* Input string from user */ printf("Enter your text : "); gets(str); for(i=0; str[i]!='\0'; i++) { /* * If current character is lowercase alphabet then * convert it to uppercase. */ if(str[i]>='a' && str[i]<='z') { str[i] = str[i] - 32; } } printf("Uppercase string : %s",str); return 0; }