Program to find sum of digits of any number given by user using for loop in C.

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/*Program to find sum of digits of any number given by user max. 5 digits*/

#include<stdio.h>
#include<conio.h>

void main()
{
int num,num1,rem,sum,i;
clrscr();

sum=0;
printf("\n\tSum of Digits Finder");
printf("\n-------------------------");
printf("\nEnter a number:");
scanf("%d",&num);

num1=num; //to save actual number
for(i=1;num1>=1;i++)
{
rem=num1%10;
num1=num1/10;
sum=sum+rem;
}

printf("\nSum of all digits = %d",sum);

getch();

}

Program to print reverse order number in using while loop in C.

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/*Program to print reverse order number */
#include<stdio.h>
#include<conio.h>
void main()
{

int i;
clrscr();
i=10;

while(i>=1)
{
printf("%d",i);
printf("\n");
i--; // decrement Operator  
}

getch();
}

Write a program to enter marks of a student in five subjects and find grade in C.

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/*program to enter marks of a student in five subjects and find grade as

=> average>90   A+
=> average<90 and average<75 A
=> average<75 and average >60 B
=> average<60 and average >50 C
=> average<50 D

*/

#include<stdio.h>
#include<conio.h>
void main()
{
int m1,m2,m3,m4,m5; // marks in five subjects
float avg; 
clrscr();


/* Accepting marks of five subjects */
printf("\nEnter marks(max. 100):");
printf("\nEnglish:");
scanf("%d",&m1);

printf("\nMaths:");
scanf("%d",&m2);

printf("\nPhysics:");
scanf("%d",&m3);

printf("\nChemistry:");
scanf("%d",&m4);

printf("\nBiology:");
scanf("%d",&m5);

/*Calculation of average */

avg=(m1+m2+m3+m4+m5)/5;

/*Percentage */
printf("\nPercentage: %.3f%",avg);

/*Selection of grade */

if(avg>=90)
{
printf("\nGrade : A+");
}
else if(avg<90 && avg>=75)
{
printf("\nGrade : A");
}
else if(avg<75 && avg>=60)
{
printf("\nGrade : B");
}else if(avg<60 && avg>=50)
{
printf("\nGrade : C");
}else if(avg<50)
{
printf("\nGrade : D");
}

getch();
}

Program to calculate sum of cubic series using while loop without power function in C.

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/*program to calculate sum of the series 
(1*1*1)+(2*2*2)+(3*3*3)+(4*4*4)+.......+(n*n*n).
cube number series. 
without using power function.
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nCubic Number Series ");

printf("\nSeries= ");

i=1;           //initialization

while(i<=num)
{
sum=sum+(i*i*i);
printf("+ (%d*%d*%d)",i,i,i);

i++;           //increment post fix operator 

}

printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of square series using power function and while loop in C.

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/*program to calculate sum of the series 
(1*1)+(2*2)+(3*3)+(4*4)+.......+(n*n).
Square number series. 
by using power function.
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
#include<math.h>   //for power function
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nSquare Number Series ");

printf("\nSeries= ");

i=1;              //initialization

while(i<=num)
{

sum=sum+pow(i,2);  //power function

printf("+ (%d*%d)",i,i);

i++;            //increment post fix operator 

}

printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of square series using while loop in C.

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/*program to calculate sum of the series 
(1*1)+(2*2)+(3*3)+(4*4)+.......+(n*n).
Square number series. 
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nSquare Number Series ");

printf("\nSeries= ");

i=1;                   //initialization 

while(i<=num)
{
sum=sum+(i*i);
printf("+ (%d*%d)",i,i);

i++;       // increment post fix operator 

}

printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of odd-even number series using while loop in C.

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/*program to calculate sum of the series
1-2+3-4+5-6+7-8+9.......+n
odd-even number series(alternative)
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,evensum,oddsum,sum,num;

clrscr();

evensum=0;
oddsum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nOdd Number Series ");

printf("\nSeries= ");

i=1;                     //initialization

while(i<=num)
{

if(i%2==0)          // % modulus operator
{
printf(" - ");
evensum=evensum+i;
}
else
{
printf(" + ");
oddsum=oddsum+i;
}
printf("%d",i);

i++;                 //increment post fix operator

}

sum=oddsum-evensum;

printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of odd number series using while loop in C.

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/*program to calculate sum of the series 
1+3+5+7+9.......+n
odd number series
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nOdd Number Series ");

printf("\nSeries= ");

i=1;                      //initialization 
while(i<=num)      //test condition 
{

if(i%2!=0)            //% modulus operator  
{
printf(" + %d ",i);
sum=sum+i;
}
i++;                   //increment post fix operator
}
printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of even series using while loop in C.

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/*program to calculate sum of the series
2+4+6+8.......+n
even number series
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nEven Number Series ");

printf("\nSeries= ");

i=1;
while(i<=num)
{

if(i%2==0)      //modulus operator
{
printf(" + %d ",i);
sum=sum+i;
}
i++;                //increment operator
}
printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of the even-odd series using for loop in C.

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/*program to calculate sum of the series 
1-2+3-4+5-6+7-8+9.......+n
odd-even number series(alternative) 
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,evensum,oddsum,sum,num;

clrscr();

evensum=0;
oddsum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nOdd Number Series ");

printf("\nSeries= ");
for(i=1;i<=num;i++)
{

if(i%2==0)
{
printf(" - ");
evensum=evensum+i;
}
else
{
printf(" + ");
oddsum=oddsum+i;
}
printf("%d",i);
}

sum=oddsum-evensum;

printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of the odd number series using for loop in C.

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/*program to calculate sum of the series 
1+3+5+7+9.......+n
odd number series
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nOdd Number Series ");

printf("\nSeries= ");
for(i=1;i<=num;i++)
{

if(i%2!=0)
{
printf(" + %d ",i);
sum=sum+i;
}

}
printf("\n\nSum of series= %d",sum);

getch();
}