To find average of two numbers.
1#include <stdio.h>
2int main()
3{
4 float a;
5 float b;
6 printf("give the values for a and b:\n");
7 scanf("%f%f", &a,&b);
8 float c=(a+b)/2;
9 printf("the average of two numbers is %f\n", c);
10 return 0;
11}
To find the binary equivalent of a number.
1#include <stdio.h>//LEARN!!!
2int main()
3{
4 int n,r;
5 printf("enter the values for n:");
6 scanf("%d", &n);
7 int binary=0,rem,count=1;
8 while(n>0&&n<255){
9 rem=n%2;
10 binary=binary+(count*rem);
11 n=n/2;
12 count=count*10;
13 }
14 printf("the binary equivalent is %d", binary);
15 return 0;
16}
Using Reccursion
1#include <stdio.h>
2int main()
3{
4 unsigned i, r;
5 printf("ENTER THE NUMBER:");
6 scanf("%d", &i);
7 //using for loop:
8 // if (i < 255 && i > 0)
9 // {
10 // for (; i > 0; i = i / 2)
11 // {
12 // printf("%d", i % 2);
13 // }
14 // }
15 // else
16 // {
17 // printf("given number is not in range");
18 // }
19
20 if (i < 255 && i > 0)
21 {
22
23 while (1)
24 {
25 r = i % 2;
26 printf("%d", r);
27
28 if (i / 2 == 0)
29 {
30 break;
31 }
32 else
33 {
34 i = i / 2;
35 }
36 }
37 }
38 else
39 {
40 printf("given number is not in range");
41 }
42}
Checking whether the number is prime or not.
1#include <stdio.h>
2int main()
3{ int a,i,flag;
4float b;
5 printf("enter the number:\n");
6 scanf("%d", &a);
7 for(i=2;i<a;i++){
8
9 if(a%i==0){
10 flag=1;
11 break;
12
13 }}
14 if(flag==0){
15 printf("prime number");
16 }
17 else{
18 printf("not prime");
19 }
20
21
22
23 return 0;
24}
Using Conditional Statements
1#include <stdio.h>
2#include <string.h>
3
4void main()
5{
6 int i = 0;
7
8 if (i > 10){
9 printf("value is greater then 10");
10 }
11 else if( i > 5 ){
12 printf("value is greater then 5");
13 }else if(i > 1){
14 printf("value is less then 10 and 5");
15 }else{
16 printf("jdfjsldjflsd");
17 }
18
19 i = 1;
20 switch (i)
21 {
22 case 1:
23 printf("hi this is 1");
24 break;
25 case 2:
26 printf("hi this is 2");
27 default:
28 printf("mujhe nahi pata");
29 }
30
31
32 // checking the condition with logical operators
33 // [and &&] - [OR ||] [not !]
34 i = 6;
35
36 if (i > 4 && i < 8){
37 printf(" i in the range of 4 to 6 \n ");
38 }
39
40 if (i > 4 || i < 10 ){
41 printf(" i in the range of 4 and 6 \n");
42 }
43
44 if (!0){
45 printf(" this is true conditions");
46 }
47
48
49 // printf("hi");
50}
To find the greatest of all of the given values.
1#include <stdio.h>
2int main()
3{
4 float a, b, c;
5 printf("enter the values:\n");
6 scanf("%f%f%f", &a, &b, &c);
7 if (a > b && a > c)
8 {
9 printf("the greatest of all is %f", a);
10 }
11 else if (b > a && b > c)
12 {
13 printf("the greatest of all is %f", b);
14 }
15 else
16 {
17 printf("greatest of all is %f", c);
18 }
19 return 0;
20}
To print the min and max from the list.
1#include <stdio.h>
2int main()
3{
4 int a[10], n, i, max = 0,min=a[0];
5 printf("\nenter the size of the list");
6 scanf("%d", &n);
7 printf("enter the elements of the list");
8 for (i = 0; i < n; i++)
9 {
10 scanf("%d", &a[i]);
11 }
12 printf("\nthe given list is");
13 for (i = 0; i < n; i++)
14 {
15 printf("%d", a[i]);
16 printf("\n");
17 }
18 for (i = 0; i < n; i++)
19 {
20 if (a[i] > max)
21 {
22 max = a[i];
23 }
24 if (a[i] < min)
25 {
26 min = a[i];
27 }
28
29 }
30 printf("\nmax is %d",max);
31 printf("\nmin is %d",min);
32
33 return 0;
34}
To print the multiplication table of a given number.
1#include <stdio.h>
2int main()
3{
4 int i,j,count;
5 printf("enter the number and the number of rows:");
6 scanf("%d%d", &i, &j);
7 for(count=1;count<=j;count++){
8 printf(" \n%d * %d = %d", i, count, i * count);
9 }
10 return 0;
11}
To find the palindrome of a given value.
1#include <stdio.h>
2int main()
3{ unsigned n;
4 printf("enter the value");
5 scanf("%d", &n);
6 int rem,num;
7 int rev=0;
8 num=n;
9 while(num!=0){
10 rem=num%10;
11 rev=rev * 10+rem;
12 num=num/10;
13 }
14 printf("reverse is %d", rev);
15 if(rev==n){
16 printf("\npalindrome");
17
18 }
19 else{
20 printf("not palindrome\n");
21 }
22 return 0;
23}
To check whether the given number is prime or not.
1#include <stdio.h>
2int main()
3{
4 int i, count;
5 printf("enter the number:");
6 scanf("%d", &i);
7 int flag = 0;
8 for (count = 2; count < i; count++)
9 {
10 if (i % count == 0){
11 flag = 1;
12 break;
13 }
14 }
15
16 if(flag == 0){
17 printf("Provided number is a prime number");
18 }else{
19 printf("Provided number is not a prime number");
20 }
21
22 return 0;
23}
To find the roots of a quadratic equation.
1#include <stdio.h>
2#include <math.h>
3int main()
4{
5 double a, b, c, r1, r2;
6 printf("enter the values for a,b,c:");
7 scanf("%lf%lf%lf", &a, &b, &c);
8 double d = b * b - 4 * a * c;
9 if (d > 0)
10 {
11 r1 = (-b + sqrt(d)) / (2 * a);
12 r2 = (-b - sqrt(d)) / (2 * a);
13 printf("r1=%lf r2=%lf", r1, r2);
14 }
15 else if (d == 0)
16 {
17
18 printf("roots are %lf", b / (2 * a));
19 }
20 else
21 {
22 printf("imaginary roots");
23 }
24}
Range of a value.
1#include<stdio.h>
2int main()
3{
4 int x = 21500000000; //it is out of the range that's why it will print any garbage value
5 printf("the value of x is %d", x);
6 return 0;
7}
To find the reverse of a given number.
1#include <stdio.h>
2int main()
3{
4 int i, j, k;
5 printf("ENTER THE NUMBER:");
6 scanf("%d", &i);
7 int n = 10;
8 printf("%d", i % 10);
9 j = i / 10;
10 printf("%d", j % 10);
11 k = i / 100;
12 printf("%d", k);
13
14 return 0;
15}
To calculate simple of compound interest.
1#include <stdio.h>
2int main()
3{
4 float p, r, t, f;
5 printf("ENTER THE VALUES FOR P,R,T:");
6 scanf("%f%f%f", &p, &r, &t);
7 float s = (p * r * t) / 100;
8 float d = 1 + r / 100;
9
10
11 int count;
12 float rem;
13 for (count = 1; count < t; count++)
14 {
15 d *= d;
16 }
17 printf("\n SIMPLE INTEREST:%f", s);
18 printf("\n COMPOUND INTEREST:%f", p * d);
19 return 0;
20}
Using sizeof function.
1#include <stdio.h>
2int main(){
3 int a;
4 float b;
5 double c;
6 char d;
7 printf("\n the size of integer is %ld", sizeof(a));
8 printf("\n the size of float is %ld", sizeof(b));
9 printf("\n the size of double is %ld", sizeof(c));
10 printf("\n the size of character is %ld", sizeof(d));
11 return 0;
12
13}
To find the sum of the digits of a number.
1#include <stdio.h>
2int main()
3{ unsigned n;
4int rem,sum=0;
5 printf("enter the number:");
6 scanf("%u", &n);
7 while(n!=0){
8 rem=n%10;
9 sum=sum+rem;
10 n=n/10;
11 }
12 printf("the sum is:%d\n",sum);
13 return 0;
14}
