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• Write a C program to print natural numbers from 1 to N using for loop.
• Write a C program to print numbers from 1 to 10 using while loop.
• Write a C program to print numbers from 1 to 100 using do while loop.

Required Knowledge

• C printf and scanf functions
• For loop in C
• While loop in C
• Do while loop in C

C program to print natural numbers from 1 to N using for loop

#include <stdio.h>  
   
int main() {  
    int counter, N;  
    /* 
     * Take a positive number as input form user 
     */ 
    printf("Enter a Positive Number\n");  
    scanf("%d", &N);  
   
    printf("Printing Numbers form 1 to %d\n", N);  
    /* 
     * Initialize the value of counter to 1 and keep on 
     * incrementing it's value in every iteration till
     * counter <= N 
     */
    for(counter = 1; counter <= N; counter++) {  
        printf("%d \n", counter);  
    }
     
    return 0;  
}

Output

Enter a Positive Number
10
Printing Numbers form 1 to 10
1
2
3
4
5
6
7
8
9
10

C program to print numbers from 1 to N using while loop

#include <stdio.h>  
   
int main() {  
    int counter, N;  
    /* 
     * Take a positive number as input form user 
     */ 
    printf("Enter a Positive Number\n");  
    scanf("%d", &N);  
   
    printf("Printing Numbers form 1 to %d\n", N);  
    /* 
     * Initialize the value of counter to 1 and keep on 
     * incrementing it's value inside while loop body 
     * in every iteration 
     */
    counter = 1;
    while(counter <= N) {  
        printf("%d \n", counter);  
        counter++;
    }
     
    return 0;  
}

Output

Enter a Positive Number
7
Printing Numbers form 1 to 7
1
2
3
4
5
6
7

C program to print numbers from 1 to N using do while loop

#include <stdio.h>  
   
int main() {  
    int counter, N;  
    /* 
     * Take a positive number as input form user 
     */ 
    printf("Enter a Positive Number\n");  
    scanf("%d", &N);  
   
    printf("Printing Numbers form 1 to %d\n", N);  
    /* 
     * Initialize the value of counter to 1 and keep on 
     * incrementing it's value inside do-while loop body 
     * in every iteration 
     */
    counter = 1;
    do {  
        printf("%d \n", counter);  
        counter++;
    } while(counter <= N);
     
    return 0;  
}

Output

Enter a Positive Number
5
Printing Numbers form 1 to 5
1
2
3
4
5

• Write a C program to find the area and perimeter of a rhombus.

A rhombus is quadrilaterals(having four sides) with all sides equal in length and opposites sides parallel. Opposite angles of a rhombus are also equal. A rhombus is a special case of parallelogram where all sides are equal in length.

• Diagonals of a rhombus are perpendicular and divides each other in two equal half.
• Opposite sides of a rhombus are parallel and all sides are equal in length.
• Opposite angles of a rhombus are equal.
• The sum of any two adjacent angles of a rhombus are 180 degrees.
• The diagonal of rhombus bisects the interior angle.

To calculate the area of rhombus we need length of Base and Height of length of both diagonals.

Base : We can choose any side of a rhombus as base to calculate area of rhombus.
Height : Height of a rhombus is the perpendicular distance between the base and it’s opposite side.
Diagonals : A line segment joining opposite vertices of a rhombus.

Area of Rhombus A Rhombus is also a parallelogram. Hence, If we know the length of Base and Height then we can calculate area of rhombus by multiplying Base and Height.

• Area of Rhombus = B X H

Where, B is the length of base of Rhombus.
H is the length of height of Rhombus.
(Base and Height are perpendicular on each other)

If we know the length of both diagonals of a rhombus the, it’s area can be calculated by multiplying length of both diagonals and then dividing it by 2.

• Area of Rhombus = (Product of diagonals)/2 = (A X B)/2

Where A and B are the length of diagonals of rhombus

C Program to find the area of the rhombus

To calculate the area of a rhombus we need the length of both diagonals of a rhombus. Below program first takes the length of diagonals as input from user and stores it in two floating point numbers. Now, to find the area of rhombus we take semi product of diagonals. It finally prints the area of rhombus on screen using printf function.

/*
* C Program to calculate area of rhombus
*/
#include <stdio.h>
#include <conio.h>
 
int main(){
    float diagonalOne, diagonalTwo, area;
    printf("Enter the length of diagonals of rhombus\n");
    scanf("%f %f", &diagonalOne, &diagonalTwo);
    /* Area of rhombus = (product of diagonals)/2 
                       = (diagonalOne X diagonalTwo)/2 */
    area = (diagonalOne * diagonalTwo)/2;
    printf("Area of rhombus : %0.4f\n", area);
     
    getch();
    return 0;
}

Program Output

Enter the length of diagonals of rhombus
3.5 4
Area of rhombus : 7.0000

C Program to find the perimeter of rhombus

The perimeter of a rhombus is the linear distance around the boundary of the rhombus. In other words, we can think of perimeter of a rhombus as the length of fence needed to enclose a rhombus.

Perimeter of Rhombus The perimeter of a Rhombus can be calculated by adding the length of all four sides of Rhombus. As we know the length of all sides of rhombus are equal, so perimeter of rhombus is equal to four times side of rhombus.

• Perimeter of Rhombus = 4 X S

Where, S is the length of any side of rhombus.

/*
* C Program to calculate perimeter of rhombus
*/
#include <stdio.h>
#include <conio.h>
 
int main(){
 float side, perimeter;
 printf("Enter the length of side of rhombus\n");
 scanf("%f", &side);
 /* Perimeter of rhombus = 4 X Side */
 perimeter = 4 * side;
 printf("Perimeter of rhombus : %0.4f\n", perimeter);
  
 getch();
 return 0;
}

Program Output

Enter the length of side of rhombus
6.5
Perimeter of rhombus : 26.0000

To calculate the perimeter of rhombus, we need length of side of rhombus. Above program, first takes length of any side of rhombus as input from user and stores it in a floating-point variable. Then, we multiply length of side by 4 and store the result in a floating point variable called ‘perimeter’. Finally, it prints the perimeter of Rhombus on screen using printf function.

Interesting Facts about Rhombus

• A rhombus has rotational symmetry.
• The shape of basketball ground is rhombus.
• A square is also a rhombus, having equal sides and all interior angles as 90 degrees.
• A rectangle is also a rhombus, having opposites sides equal parallel and all interior angles as 90 degrees.
• A rhombus is a special case of parallelogram, where all sides are equal.
• The diagonals of rhombus intersect at right angle.

• Write a C program to enter three sides of a triangle and check whether a triangle is valid or not.

Required Knowledge

• C printf and scanf functions
• If Else statement in C
• Relational Operators in C

A triangle is a valid triangle, If and only If, the sum of any two sides of a triangle is greater than the third side.

For Example, let A, B and C are three sides of a triangle. Then, A + B > C, B + C > A and C + A > B.

C program to check whether a triangle is valid, given sides of triangle

/*
 * Given three sides of a triangle, Write a c program to 
 * check whether it is a valid triangle or not 
 */ 
   
#include <stdio.h>  
   
int main() {  
    int side1, side2, side3;  
   
    /* 
     * Take length of three sides of triangle as input 
     * from user using scanf 
     */ 
    printf("Enter Length of Three Sides of a Triangle\n");  
    scanf("%d %d %d", &side1, &side2, &side3);     
   
    if((side1 + side2 > side3)&&(side2 + side3 > side1)
            &&(side3 + side1 > side2)) {  
        printf("It is a Valid Triangle\n");  
    } else {  
        printf("It is an invalid Triangle");  
    }  
   
    return 0;  
}

Output

Enter Length of Three Sides of a Triangle
10 20 20
It is a Valid Triangle

Enter Length of Three Sides of a Triangle
10 20 40
It is an invalid Triangle

• Write a C program to read three angles of a triangle and check whether a triangle is valid or not.

Required Knowledge

• C printf and scanf functions
• If Else statement in C

A triangle is a valid triangle, If and only If the sum of all internal angles is equal to 180. This is known as angle sum property of triangle. We will use this triangle property to check whether three given angles can form a valid triangle.

C program to check whether a triangle is valid, given angles of triangle

/*
 * Given three angles of a triangle, Write a c program to 
 * check whether it is a valid triangle or not 
 */ 
   
#include <stdio.h>  
   
int main() {  
    int angle1, angle2, angle3;  
   
    /* 
     * Take three angles of triangle as input 
     * from user using scanf 
     */ 
    printf("Enter Three Angles of a Triangle\n");  
    scanf("%d %d %d", &angle1, &angle2, &angle3);     
   
    /* 
     *Sum of all three angles of any triangle is 180 degree 
     */ 
    if( angle1 + angle2 + angle3 == 180) {  
        printf("It is a Valid Triangle\n");  
    } else {  
        printf("It is an invalid Triangle");  
    }  
   
    return 0;  
}

Output

Enter Three Angles of a Triangle
30 60 90
It is a Valid Triangle

Enter Three Angles of a Triangle
60 70 80
It is an invalid Triangle

• Write a C program to check a character is decimal digit or not using conditional or ternary operator.

Required Knowledge

• C printf and scanf functions
• Conditional Operator in C

In this program, we will check whether the ASCII value of input character(C)is in between the ASCII value of ‘0’ and ‘9’ decimal digit character(including ‘0’ and ‘9’).

In other words, If ‘0’ <= C <= ‘9’ is true, then C is a decimal digit character.

C program to check for decimal digit characters using conditional operator

#include <stdio.h>  
   
int main() {  
    char c;
    int isDigit;  
   
    /* Take a character as input from user
  using scanf function */
    printf("Enter a Character\n");  
    scanf("%c", &c); 
     
    /* Check, If input character is digit */ 
    isDigit =  ((c >= '0') && (c <= '9'))? 1 : 0;  
     
    if(isDigit == 1)
        printf("%c is Decimal Digit Character\n", c);
    else
        printf("%c is Not a Digit Character\n", c);
   
    return 0;  
}

Output

Enter a Character
7
7 is Decimal Digit Character

Enter a Character
A
A is Not a Digit Character