Design 2:

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

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int i,j,a;
for(i=5;i>=1;i–)
{
for(j=1;j<=i;j++)
{
printf(“*”);
}
printf(“\n”);
}
getch();
}

Design 4:

1
10
101
1010
10101

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int i,j,a;
for(i=1;i<=5;i++)
{
for(j=1;j<=i;j++)
{
a=j%2;
printf(“%d”,a);
}
printf(“\n”);
}
getch();
}

Print even numbers from 1 to n.

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int i,n;
scanf(“%d,&n);
for(i=2;i<=n;i=i+2)
{
printf(“%d\t”,i);
}
getch();
}

Suppose P is the initial amount (which is lent, deposited, invested or principal), t is the time or tenure & r is rate of interest, then Simple Interest (SI) can be calculated as below:

From the above formula, Principal (P), Rate (r) & Time (t) can be calculated as follows:

And, final Amount (A) can be calculated as:

Example:

Suppose a certain sum of money is deposited at 5% per annum Simple Interest, which amounted to Rs. 50,000 after 10 years. Then the sum of money can be calculated by the following:

Amount = A = Rs. 50,000

Rate = r = 5

Time = t = 10

Therefore, Principal = P = the sum of money = A/(1+((t x r)/100)) = 50000/(1+((10 x 5)/100)) = 50000/(1+(5/10)) = (50000 x 10)/15 = Rs. 33,333.33

and. Simple Interest = SI = A-P = 50000 – 33333.33 = Rs. 16,666.67

Do While Loop

Main concept

do
{
statement;
}
while(condition);

AS LONG AS THE CONDITION IS VALID, THE STATEMENT, INSIDE THE WHILE (OR DO WHILE) LOOP, WILL KEEP ON RUNNING, NO MATTER WHAT THE STATEMENT IS

Print “THIS IS A TEXT” n times using do while.

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int a=1,n;
scanf(“%d”,&n);
do
{
printf(“THIS IS A TEXT\n”);
}
while(a<=n);
getch();
}

\t IS USED FOR 1 TAB

\n IS USED FOR NEW LINE

Print the greatest number among 3 given numbers.

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int a,b,c;
scanf(“%d %d %d”,&a,&b,&c);
if(a>b && a>c)
{
printf(“%d is the greatest”,a);
}
else if(b>a && b>c)
{
printf(“%d is the greatest”,b);
}
else if(c>a && c>b)
{
printf(“%d is the greatest”,c);
}
getch();
}

SCANF IS USED FOR USER INPUT

Step 1:

Look for brackets and complete the calculations inside them, according bracket order:

FIRST    SECOND    THIRD

Step 2:

Look for any kind of roots (square roots, cube roots and others), indices (square of a number, cube of a number and others), exponents and powers.

Step 3:

Look for any kind of division and solve the calculations.

Step 4:

Look for any kind of multiplications and solve the calculations.

Step 5:

Look for any kind of additions and solve the calculations.

Step 6:

Look for any kind of subtractions and solve the calculations.

Header Files

• conio.h: CONsole Input Output (getch, clrscr)
• stdio.h: STanDard Input Output (scanf, printf)
• math.h: Mathematical functions (pow, sqrt, sin, cos, exp)
• string.h: Character & string functions (char, strlen, String)

THERE ARE MANY OTHER HEADER FILES IN C
ALL ARE USABLE ACCORDING TO REQUIREMENTS

Print the addition result of 3 & 5.

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int a=3,b=5,c=0;
c=a+b;
printf(c);
getch();
}

PRINTF IS USED FOR SHOWING THE OUTPUT

Circle

Rectangle

Square

Triangle

SOP Example: