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# Entering Compiling and Running C Programs Problem 1 A program is required which prints all the odd numbers from 0 to 25.

Extracts from this document...

Introduction

Section A

Entering –Compiling and Running C Programs

Problem 1

A program is required which prints all the odd numbers from 0 to 25.

/*****************

*Problem Number 1*

******************/

#include<stdio.h>

void main()

{

int START=1;

clrscr();

do

{

printf("%d",START);

START=START+2;

}while(START<=25);

getch();

}

Output  of the above program

Modify the Program:

*To print the even numbers between 0 and 25.

/*****************

*Problem Number 1*

******************/

#include<stdio.h>

void main()

{

int START=2;

clrscr();

do

{

printf("%d",START);

START=START+2;

}while(START<25);

getch();

}

Output of the above program

Modify the Program:

*To print the even numbers between 0 and 50.

/*****************

*Problem Number 1*

******************/

#include<stdio.h>

void main()

{

int START=2;

clrscr();

do

{

printf("%d                ",START);

START=START+2;

}while(START<=50);

getch();

}

Output of the above program

Modify the Program:

*To print the odd numbers between 15 and 35 along one line separated by a comma.

/*****************

*Problem Number 1*

******************/

#include<stdio.h>

void main()

{

int START=15;

clrscr();

do

{

printf("%d,",START);

START=START+2;

}while(START<=35);

getch();

}

Output of the above program

What is the purpose of the function getch()?

It gets the characters on the screen what the program  has to execute.

Problem 2

Write a program to determine if a given integer number  is dividable by 3

/******************

*Problem Number 2*

******************/

#include<stdio.h>

void main()

{

int N;

float R;

clrscr();

printf("Enter an integer Number: \n");

scanf("%d",&N);

R=N % 3;

if(R==0)

{

printf("%d is dividable by 3. \n" ,N);

}

else

{

printf("%d is NOT dividable by 3. \n",N);

}

getch();

}

Output of the above program

Modify the Program to determine if a given number is dividable by 5.

/******************

*Problem Number 2*

******************/

#include<stdio.h>

...read more.

Middle

/******************

*Problem Number 4*

******************

#include<stdio.h>

void main()

{

int I,N1,N2;

int s=0;

clrscr();

printf("Enter an integer N1: \n");

scanf("%d",&N1);

printf("Enter an integer N2 greater than N1: \n");

scanf("%d",&N2);

i=N1;

do

{

s=s+i;

i=i+1;

}while(i<=N2);

printf("The Sum=%d\n",s);

getch();

}

Output of the program

In the above program user enters 10 instead of  N1 and enters 30 instead of  N2,so the sum  is

10+11+………..+30=420.

Write a program to continuously calculate the average of two numbers until the user requests to end.

/******************

*Problem Number 5*

******************

#include<stdio.h>

#include<string.h>

#include<graphics.h>

void main()

{

int N1,N2;

float Av;

char c;

do

{

clrscr();

textcolor(CYAN);

cprintf("Enter an inter Number:");

scanf("%d",&N1);

cprintf("Enter another integer Number:");

scanf("%d",&N2);

Av=(float)(N1+N2)/2;

textcolor(GREEN);

cprintf("The Average of Numbers %d and %d=%f",N1,N2,Av);

gotoxy(20,22);

textcolor(YELLOW);

cprintf("Would you like to try again? <Y/N>:");

c=getch();

c=toupper(c);

}

while(c=='Y');

textcolor(LIGHTGRAY);

}

Output of the program

What are the functions of:

• c=getch;

It gets the characters on the screen what the program  has to execute.

• Gotoxy(20,22);

It determines  the location of the particular character/sentence on the screen, it means that the space

and line number.

Section B: Writing Simple Programs

Problem 1

Write a program to print integer numbers from 10 down to 1 in steps of 1 on the screen.

#include<stdio.h>

void main(void)

{

int a=10;

clrscr();

do

{

...read more.

Conclusion

printf("\n%d\n",n);

i++;

}

while(i<N);

getch();

}

Output of the program

Problem 10

This program ,we design a simple 4-function calculator.

#include<stdio.h>

void main()

{

int a,b;

float S;

char op;

clrscr();

printf("Enter Expression as <a><op><b>=<Enter>:\n");

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

switch(op)

{

case '+':

{

S=a+b;

break;

}

case '-':

{

S=a-b;

break;

}

case '/':

{

if(b==0)

{

printf("Divide By Zero Error!\n");

getch();

return;

}

else

{

S=a/b;

}

break;

}

case'*':

{

S=a*b;

break;

}

default:

{

printf("Operation Unknown!\n");

break;

}

}

printf("\n\nResult:  %d %c %d = %.2f \n",a,op,b,S);

getch();

}

Output of the program(operation ‘+’)

Output of the program(operation ‘-’)

Output of the program(operation ‘*’)

Problem 11

Write a program to generate 10 random numbers between 1 and 15 and store them in a table.

#include<stdio.h>

#include<time.h>

#include<stdlib.h>

void main(void)

{

int T[10],N;

int j=0;

clrscr();

randomize();

do

{

N=random(15)+1;

T[j]=N;

j=j+1;

}

while(j<10);

j=0;

do

{

printf("%d\n",T[j]);

j=j+1;

}

while(j<10);

getch();

}

Output of the program

Functions/Procedures in C.

Write a program to add two numbers together.

#include<stdio.h>

int ADD(int x,int y);

void PRINT(int x,int y,int z);

void main(void)

{

int A=256,B=483,C;

C=ADD(A,B);

PRINT(A,B,C);

getch();

}

int ADD(int x,int y)

{

int s;

s=x+y;

return(s);

}

void PRINT (int x,int y,int z)

{

printf("The sum of %d and %d=%d\n",x,y,z);

}

Output of the program

...read more.

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