string test in c

#include <stdio.h>

int main ()
 {

   char greeting[6] = {'H', 'e', 'l', 'l', 'o', '\0'};
   printf("Greeting message: %s\n", greeting );
   return 0;
}

output::::

null pointer in c

#include <stdio.h>

int main () {

   int  *ptr = NULL;
   printf("The value of ptr is : %x\n", ptr  );
   return 0;
}

output:::

little change in program:

#include <stdio.h>

int main () {

   int  *ptr = NULL;

   printf("The value of ptr is : %d\n", ptr  );

   return 0;

}

out put is same as above.

pointer in c

#include <stdio.h>

int main () {

   int  var = 20;   /* actual variable declaration */
   int  *ip;        /* pointer variable declaration */

   ip = &var;  /* store address of var in pointer variable*/

   printf("Address of var variable: %x\n", &var  );

   /* address stored in pointer variable */
   printf("Address stored in ip variable: %x\n", ip );

   /* access the value using the pointer */
   printf("Value of *ip variable: %d\n", *ip );

   return 0;
}

output:::

Note:

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finding the address of variables in c

#include <stdio.h>

int main () {

   int  var1;
   char var2[10];

   printf("Address of var1 variable: %x\n", &var1  );
   printf("Address of var2 variable: %x\n", &var2  );

   return 0;
}

output:::

accessing array elements in c

#include <stdio.h>

int main () {

   int n[ 10 ]; /* n is an array of 10 integers */
   int i,j;

   /* initialize elements of array n to 0 */
   for ( i = 0; i < 10; i++ ) {
      n[ i ] = i + 100; /* set element at location i to i + 100 */
   }

   /* output each array element's value */
   for (j = 0; j < 10; j++ ) {
      printf("Element[%d] = %d\n", j, n[j] );
   }

   return 0;
}

output::

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global variable values not considered in function calling from main in c

#include <stdio.h>

/* global variable declaration */
int a = 20;

int main () {

  /* local variable declaration in main function */
  int a = 10;
  int b = 20;
  int c = 0;

  printf ("value of a in main() = %d\n",  a);
  c = sum( a, b);
  printf ("value of c in main() = %d\n",  c);

  return 0;
}

/* function to add two integers */
int sum(int a, int b) {

   printf ("value of a in sum() = %d\n",  a);
   printf ("value of b in sum() = %d\n",  b);

   return a + b;
}

output:::

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global and local same variable names in c

#include <stdio.h>


int g=30;

int main () {

  /* local variable declaration */
  int g=20;
  printf ("value of g = %d\n",g);

  return 0;
}

output::

accessing global variable from the main function in c

#include <stdio.h>


int g;

int main () {

  /* local variable declaration */
  int a, b;

  /* actual initialization */
  a = 10;
  b = 20;
  g = a + b;

  printf ("value of a = %d, b = %d and g = %d\n", a, b, g);

  return 0;
}

output::

find the large value in given two integer using function in c

#include <stdio.h>

/* function declaration */
int max(int num1, int num2);

int main () {
    int a;
   int b;
   int ret;

   printf("enter the values\n");
   scanf("%d%d",&a,&b);


   ret = max(a, b);
   printf( "Max value is : %d\n", ret );

   return 0;
}

/* function returning the max between two numbers */
int max(int num1, int num2) {

   int result;

   if (num1 > num2)
      result = num1;
   else
      result = num2;

   return result;
}

output::

little compressed the program:

#include <stdio.h>

/* function declaration */
int max(int num1, int num2);

int main () {
    int a,b,ret;
    printf("enter the values\n");
   scanf("%d%d",&a,&b);
   ret = max(a, b);
   printf( "Max value is : %d\n", ret );
   return 0;
}
/* function returning the max between two numbers */
int max(int num1, int num2)
 {
   if (num1 > num2)
      return num1;
   else
      return num2;
}

Note:

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swap using functions in c

#include <stdio.h>

/* function declaration */
void swap(int x, int y);

int main () {

   /* local variable definition */
   int a = 100;
   int b = 200;

   printf("Before swap, value of a : %d\n", a );
   printf("Before swap, value of b : %d\n", b );

   /* calling a function to swap the values */
   swap(a, b);

   printf("After swap, value of a : %d\n", a );
   printf("After swap, value of b : %d\n", b );

   return 0;
}
/* function definition to swap the values */
void swap(int x, int y) {

   int temp;

   temp = x; /* save the value of x */
   x = y;    /* put y into x */
   y = temp; /* put temp into y */

   return;
}

output::

Note:

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also write interview questions which are you faced in during interview related to C Language.

so i can try to solve them and send you back.

extern keyword

#include <stdio.h>

// Variable declaration:
extern int a, b;
extern int c;
extern float f;

int main () {

   /* variable definition: */
   int a, b;
   int c;
   float f;

   /* actual initialization */
   a = 10;
   b = 20;
   c = a + b;
   printf("value of c : %d \n", c);

   f = 70.0/3.0;
   printf("value of f : %f \n", f);

   return 0;
}

output::