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Add digits using recursion #include <stdio.h> int add_digits(int); int main() { int n, result; scanf("%d", &n); result = add_digits(n); printf("%d\n", result); return 0; } int add_digits(int n) { static int sum = 0; if (n == 0) { return 0; } sum = n%10 + add_digits(n/10); return sum; }

add digits of number in c C program to add digits of a number: Here we are using modulus operator(%) to extract individual digits of number and adding them. C programming code #include <stdio.h> 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; }

c program to check leap year c program to check leap year: c code to check leap year, year will be entered by the user. Please read the leap year article before reading the code, it will help you to understand the program. C programming code #include <stdio.h> int main() { int year; printf("Enter a year to check if it is a leap year\n"); scanf("%d", &year); if ( year%400 == 0) printf("%d is a leap year.\n", year); else if ( year%100 == 0) printf("%d is not a leap year.\n", year); else if ( year%4 == 0 ) printf("%d is a leap year.\n", year); else printf("%d is not a leap year.\n", year); return 0; }

Function to check vowel int check_vowel(char a) { if (a >= 'A' && a <= 'Z') a = a + 'a' - 'A'; /* Converting to lower case or use a = a + 32 */ if (a == 'a' a == 'e' a == 'i' a == 'o' a == 'u') return 1; return 0; }

Check vowel using switch statement #include <stdio.h> main() { char ch; printf("Enter a character\n"); scanf("%c", &ch); switch(ch) { case 'a': case 'A': case 'e': case 'E': case 'i': case 'I': case 'o': case 'O': case 'u': case 'U': printf("%c is a vowel.\n", ch); break; default: printf("%c is not a vowel.\n", ch); } return 0; }

c program to check whether input alphabet is a vowel or not This code checks whether an input alphabet is a vowel or not. Both lower-case and upper-case are checked. C programming code #include <stdio.h> main() { char ch; printf("Enter a character\n"); scanf("%c", &ch); if (ch == 'a' ch == 'A' ch == 'e' ch == 'E' ch == 'i' ch == 'I' ch =='o' ch=='O' ch == 'u' || ch == 'U') printf("%c is a vowel.\n", ch); else printf("%c is not a vowel.\n", ch); return 0; } Output: a a is vowel

Find odd or even using conditional operator #include<stdio.h> main() { int n; printf("Enter an integer\n"); scanf("%d",&n); n%2 == 0 ? printf("Even number\n") : printf("Odd number\n"); return 0; }

C program to check odd or even without using bitwise or modulus operator #include<stdio.h> main() { int n; printf("Enter an integer\n"); scanf("%d",&n); if ( (n/2)*2 == n ) printf("Even\n"); else printf("Odd\n"); return 0; }

C program to check odd or even using bitwise operator #include<stdio.h> main() { int n; printf("Enter an integer\n"); scanf("%d",&n); if ( n & 1 == 1 ) printf("Odd\n"); else printf("Even\n"); return 0; }

C program to check odd or even using modulus operator #include<stdio.h> main() { int n; printf("Enter an integer\n"); scanf("%d",&n); if ( n%2 == 0 ) printf("Even\n"); else printf("Odd\n"); return 0; }

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