Program 1/* Fibonacci Series c language */Numbers of Fibonacci sequence are known as Fibonacci numbers. First few numbers of series are 0, 1, 1, 2, 3, 5, 8 etc, Except first two terms in sequence every other term is the sum of two previous terms, For example 8 = 3 + 5 (addition of 3, 5). This sequence has many applications in mathematics and Computer Science.#include int main(){ int n, first = 0, second = 1, next, c; printf("Enter the number of terms\n"); scanf("%d",&n); printf("Fibonacci series\n"); printf(" %d \n%d\n",first,second); for ( c = 0 ; c < n ; c++ ) { next = first + second; first = second; second = next; printf("%d\n",next); } return 0;}Program 2/*Sum of Digits of a Number*/98%10 = 8 (% is modulus operator which gives us remainder when 98 is divided by 10).sum = sum + remainderso sum = 8 now.98/10 = 9 because in c whenever we divide integer by another integer we get an integer.9%10 = 9sum = 8(previous value) + 9sum = 179/10 = 0.So finally n = 0, loop ends we get the required sum.#include int main(){ int n, sum = 0, remainder; printf("Enter an integer\n"); scanf("%d",&n); while(n != 0) { remainder = n % 10; sum = sum + remainder; n = n / 10; } printf("Sum of digits of entered number = %d\n",sum); return 0;}/*One Line code for sum of digits of a number*/#include int main(){ int n, sum = 0; printf("Enter an integer\n"); scanf("%d",&n); sum = n%9; if(sum==0)sum=9;// } printf("Sum of digits of entered number = %d\n",sum); return 0;}Program 3/*ARMSTRONG NUMBER */A number is armstrong if the sum of cubes of individual digits of a number is equal to the number itself. For example 371 is an armstrong number as 33+ 73+ 13= 371. Some other armstrong numbers are: 0, 1, 153, 370, 407.#include int main(){ int number, sum = 0, temp, remainder; printf("Enter an integer\n"); scanf("%d",&number); temp = number; while( temp != 0 ) { remainder = temp%10; sum = sum + remainder*remainder*remainder; temp = temp/10; } if ( number == sum ) printf("Entered number is an armstrong number.\n"); else printf("Entered number is not an armstrong number.\n"); return 0;}Program 4Swapping of two numbers in c#include int main(){ int x, y, temp; printf("Enter the value of x and y\n"); scanf("%d%d", &x, &y); printf("Before Swapping\nx = %d\ny = %d\n",x,y); temp = x; x = y; y = temp; printf("After Swapping\nx = %d\ny = %d\n",x,y); return 0;}Swapping of two numbers without third variable

#include int main(){ int a, b; printf("Enter two integers to swap\n"); scanf("%d%d", &a, &b); a = a + b; b = a - b; a = a - b; printf("a = %d\nb = %d\n",a,b); return 0;}

Swap two numbers using pointers#include int main(){ int x, y, *a, *b, temp; printf("Enter the value of x and y\n"); scanf("%d%d", &x, &y); printf("Before Swapping\nx = %d\ny = %d\n", x, y); a = &x; b = &y; temp = *b; *b = *a; *a = temp; printf("After Swapping\nx = %d\ny = %d\n", x, y); return 0;}Swapping numbers using call by reference#include void swap(int*, int*);int main(){ int x, y; printf("Enter the value of x and y\n"); scanf("%d%d",&x,&y); printf("Before Swapping\nx = %d\ny = %d\n", x, y); swap(&x, &y); printf("After Swapping\nx = %d\ny = %d\n", x, y); return 0;} void swap(int *a, int *b){ int temp; temp = *b; *b = *a; *a = temp; }C programming code to swap using bitwise XOR#include int main(){ int x, y; scanf("%d%d", &x, &y); printf("x = %d\ny = %d\n", x, y); x = x ^ y; y = x ^ y; x = x ^ y; printf("x = %d\ny = %d\n", x, y); return 0;}Program 5Matrix multiplication in c language#include int main(){ int m, n, p, q, c, d, k, sum = 0; int first[10][10], second[10][10], multiply[10][10]; printf("Enter the number of rows and columns of first matrix\n"); scanf("%d%d", &m, &n); printf("Enter the elements of first matrix\n"); for ( c = 0 ; c < m ; c++ ) for ( d = 0 ; d < n ; d++ ) scanf("%d", &first[c][d]); printf("Enter the number of rows and columns of second matrix\n"); scanf("%d%d", &p, &q); if ( n != p ) printf("Matrices with entered orders can't be multiplied with each other.\n"); else { printf("Enter the elements of second matrix\n"); for ( c = 0 ; c < p ; c++ ) for ( d = 0 ; d < q ; d++ ) scanf("%d", &second[c][d]); for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < q ; d++ ) { for ( k = 0 ; k < p ; k++ ) { sum = sum + first[c][k]*second[k][d]; } multiply[c][d] = sum; sum = 0; } } printf("Product of entered matrices:-\n"); for ( c = 0 ; c < m ; c++ ) { for ( d = 0 ; d < q ; d++ ) printf("%d\t", multiply[c][d]); printf("\n"); } } return 0;}Program 6Transpose of a Matrix#include int main(){ int m, n, c, d, matrix[10][10], transpose[10][10]; printf("Enter the number of rows and columns of matrix "); scanf("%d%d",&m,&n); printf("Enter the elements of matrix \n"); for( c = 0 ; c < m ; c++ ) { for( d = 0 ; d < n ; d++ ) { scanf("%d",&matrix[c][d]); } } for( c = 0 ; c < m ; c++ ) { for( d = 0 ; d < n ; d++ ) { transpose[d][c] = matrix[c][d]; } } printf("Transpose of entered matrix :-\n"); for( c = 0 ; c < n ; c++ ) { for( d = 0 ; d < m ; d++ ) { printf("%d\t",transpose[c][d]); } printf("\n"); } return 0;}Program 7Factorial program in c using for loop#include int main(){ int c, n, fact = 1; printf("Enter a number to calculate it's factorial\n"); scanf("%d", &n); for (c = 1; c =c) printf("Largest number = %.2f", a); if(b>=a && b>=c) printf("Largest number = %.2f", b); if(c>=a && c>=b) printf("Largest number = %.2f", c); return 0;}/* C program to find largest number using if...else statement */

#include int main(){ float a, b, c; printf("Enter three numbers: "); scanf("%f %f %f", &a, &b, &c); if (a>=b) { if(a>=c) printf("Largest number = %.2f",a); else printf("Largest number = %.2f",c); } else { if(b>=c) printf("Largest number = %.2f",b); else printf("Largest number = %.2f",c); } return 0;}greatest number in given three numbers

#includeint main(){int a,b,c,big;printf("\nEnter 3 numbers:");scanf("%d %d %d",&a,&b,&c);big=(a>b&&a>c?a:b>c?b:c);printf("\nThe biggest number is:%d",big);return 0;}Program 10Prime number program in c language#include int main(){ int n, i = 3, count, c; printf("Enter the number of prime numbers required\n"); scanf("%d",&n); if ( n >= 1 ) { printf("First %d prime numbers are :\n",n); printf("2\n"); } for ( count = 2 ; count