C Programming Programs

Sushil Gajurel

Hellow world in C programming !!

#include< stdio.h>
int main(){
printf("Hello World");
return 0;
}

Output: Hello World

Write a C program to print your name, date of birth and mobile number using printf() and puts() functions.

#include< stdio.h>
#include< conio.h>
int main(){
printf("My Name is : Shishir Gajurel\n");
puts("Date of birth is : 2057/05/26");
puts("Phone number: 9800000000");
getch();
return 0;
}
Youtube link for this programe

Write a C program to display size in bytes of different data types using sizeof() operator.

#include< stdio.h>
#include< conio.h>
int main(){
printf("The size of integer = %d bytes", sizeof(int));
printf("\nThe size of float = %d bytes", sizeof(float));
printf("\nThe size of character = %d bytes", sizeof(char));
printf("\nThe size of long = %d bytes", sizeof(long));
printf("\nThe size of short = %d bytes", sizeof(short));
getch();
return 0;
}

Write program to compute the area and circumference of a circle with given radius r as input defining as constant (Note: Area)

#include< stdio.h>
#include< conio.h>
int main(){
float pi=3.14;
int i,r,area,cir;
printf("Enter the value of radius:");
scanf("%d",&r);
i=r*r;
area=pi*i;
cir=2*pi*r;
printf("The area of circle is:%d",area);
printf("\nThe circumference of circle is:%d",cir);
getch ();
return 0;
}

Program to convert specified no of days into years, weeks and days.  (Note: Ignore leap year.)

#include< stdio.h>
#include< conio.h>
int main(){
int num,year,month, week,day;
printf("Enter an integer:");
scanf("%d", &num);
year=num/365;
num=num%365;
month=num/30;
num=num%30;
week=num/7;
day=num%7;
printf("\nYear\tMonths\tWeeks\tDays");
printf("\n %d\t%d\t%d\t%d",year,month,week,day);
getch();
return 0;
}

Write program that accepts two integers from the user as input and calculates the sum,diference,product,quotient and remainder applying different arithmetic operators between two integers.

#include< stdio.h>
#include< conio.h>
int main(){
int num1,num2,sum,dif,mul,div,rem;
printf("Enter a number:");
scanf("%d",&num1);
printf("Enter a number:");
scanf("%d",& num2);
sum=num1+num2;
dif=num1-num2;
mul=num1*num2;
div=num1/num2;
rem=num1%num2;
printf("The addition of %d and %d is:%d",num1,num2,sum);
printf("\nThe substraction of %d and %d is:%d",num1,num2,dif);
printf("\nThe multiplication of %d and %d is:%d",num1,num2,mul);
printf("\nThe division of %d and %d is:%d",num1,num2,div);
printf("\nThe reminder of %d and %d is:%d",num1,num2,rem);
getch();
return 0;
}

Write a C program to convert a given integer (in seconds) to hours, minutes and seconds.

#include< stdio.h>
#include< conio.h>
void main(){
int sec,hr,min,rsec;
printf("Enter time in seconds:");

scanf("%d",&sec); hr=sec/3600;
rsec=sec%3600;
min=rsec/60;
sec=rsec%60;
printf("\n %d Hour, %d Minutes, %d Seconds",hr,min,sec);
getch();
}

Write a C program that accepts principle, rate of interest, time in years and computes the simple interest.

#include< stdio.h>
#include< conio.h>
void main(){
float p,t,r,i;
printf("Enter Principal, time, rate:\n");
scanf("%f%f%f",&p,&t,&r);
i=(p*t*r)/100;
printf("Interest= %f",i);
getch();
}

Write algorithm pseudo-code as well as draw flow chart to Compute the roots of the quadratic equation ax 2 +bx+c =0 for given coeficient input a, b and c. Write C program.

#include < math.h>
#include < stdio.h>
int main() {
double a, b, c, d, root1, root2, realPart, imagPart;
printf("Enter coefficients a, b and c: ");
scanf("%lf %lf %lf", &a, &b, &c);
d = b * b - 4 * a * c;
// condition for real and different roots
if (d > 0) {
root1 = (-b + sqrt(d)) / (2 * a);
root2 = (-b - sqrt(d)) / (2 * a);
printf("root1 = %.2lf and root2 = %.2lf", root1, root2);
}
// condition for real and equal roots
else if (d == 0) {
root1 = root2 = -b / (2 * a);
printf("root1 = root2 = %.2lf;", root1);
}
// if roots are not real
else {
realPart = -b / (2 * a);
imagPart = sqrt(-d) / (2 * a);
printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi", realPart, imagPart, realPart, imagPart);
}
return 0;
}

Write a C program to check a given integer is positive even, negative even, positive odd or negative odd.

#include< stdio.h>
int main(){
int a;
printf("Enter a number:");
scanf("%d", &a);
if(a%2==0){
if(a<0){
printf("The given number %d is negative even",a);
}
else{
printf("The given number positive %d is even.", a);
}
}
else{
if(a<0){
printf("The given number %d is negative odd",a);
}
else{
printf("The given number %d is positive odd.", a);
}
}
return 0;
}

write a C program that accepts three integers as input and find the largest of three.

#include< stdio.h>
int main(){
int a,b,c;
printf("Enter any three numbers:\n");
scanf("%d%d%d",&a,&b,&c);
if(a>b&&a>c){
printf("Greatest number is :%d",a);
}
else if(b>c){
printf("Greatest number is:%d",b);
}
else{
printf("Greatest number is: %d",c);
}
return 0;
}

Write a C program to find the eligibility of admission for a professional course based on the following criteria:
  Marks in Maths >=65
Marks in Phy >=55
Marks in Chem>=50
And Total in all three subject >=180 or Total in Math and Physics >=140

#include< stdio.h>
#include< conio.h>
int main(){
int m,p,c,total;
printf("Enter the marks in maths:");
scanf("%d",&m);
printf("Enter the marks in Physics:");
scanf("%d",&p);
print("Enter the marks in Chemistry:");
scanf("%d",&c);
if(m>=65&&p>=55 && c>=50 &&(m+p+c)>=180 || (m+p)>=140){
printf("You are eligible for admission !!");
}
else{
printf("Sorry !! You are not eligible for admission ");
}
getch();
return 0;
}

Write a C program to find the sum of first 100 natural numbers using loop.

#include< stdio.h>
int main(){
int n,i,sum=0;
printf("Enter a positive number to calculate sum of natural number");
scanf("%d",&n);
i=1;
while(i<=n){
sum += i;
++i;
}
printf("Sum= %d",sum);
getch();
return 0;
}

Write a program in C to display the multiplication table of a given integer.

#include< stdio.h>
void main(){
int j,n;
printf("Input the number(Table to be created):");
scanf("%d",&n);
printf("\n");
for(j=1;j<=10 ; j+ +)
{
printf("%d X %d = %d\n",n,j,n*j);
}
return 0;
}

Write an program to print the prime numbers up to 100.

#include < stdio.h>
int main()
{
int n, i = 3, count, c;
printf("Enter the number of prime numbers to print\n");
scanf("%d", &n);
if (n >= 1) {
printf("First %d prime numbers are:\n",n);
printf("2\n");
}
for (count = 2; count <= n;)
{ for (c = 2; c <= i - 1; c++)
{
if (i%c == 0)
break;
}
if (c == i)
{
printf("%d\n", i);
count++;
}
i++;
}
return 0;
}

Write a program in C to make such a pattern of astrisk(*) below using loop. 
*
* *
* * *
* * * *
up to n lines where n is an integers

#include< stdio.h>
#include< conio.h>
int main(){
int n,i,j;
printf("Enter the number of rows:");
scanf("%d",&n);
for(i=0;i<=n;i++){
for(j=1;j<=i;j++){
printf("*");
}
printf("\n");
}
getch();
return 0;
}

Write a program using loop to print the following floyd's triangle as given below when input is n.
1
2 3
4 5 6
7 8 9 10
11 12 13 14 up to n rows

#include
#include
int main(){
int n,i,j,k=0;
printf("Enter the number of rows:");
scanf("%d",&n);
for(i=0;i<=n;i++){
for(j=1;j<=i;j++){
printf("%d ",++k);
}
printf("\n ");
}
getch();
return 0;
}

Write a program in C to make such a pattern like a pyramid with numbers increased by 1.
1
2 3
4 5 6
7 8 9 10

#include
int main() {
int i, space, rows, k,m=0;
printf("Enter number of rows: ");
scanf("%d", &rows);
for (i=1; i<=rows; ++i,k=0) {
for (space=1; space<=rows-i; ++space)
{
printf(" ");
}
while (k!=2*i-1) {
printf("%d ",++m);
++k;
}
printf("\n");
}
return 0;
}

Write a program in C to make such a pattern like a pyramid with an asterisk.
  *
  * *
  * * *
  * * * *

#include
int main() {
int i, space, rows, k=0;
printf("Enter number of rows: ");
scanf("%d", &rows);
for (i=1; i<=rows; ++i,k=0) {
for (space=1; space<=rows-i; ++space)
{ printf(" ");
}
while (k!=2*i-1) {
printf("* ");
++k;
}
printf("\n");
}
return 0;
}

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