This file contains some basic C programming code

charCount.c

#include<stdio.h>
/* do while loop and break statement used to
count the number of character in the string */
int main(){
  char str[]="Grettings";
  int count=0;
  do{
    if(str[count]=='\0'){
      printf("There are %d characters in total\n",count);
      break;
    }
    count++;
  }while(1);
  return 0;
}

checkVowel.c

#include<stdio.h>
//switch case example to check vowel
int main(){
  char test;
  printf("Enter the character:");
  scanf("%c",&test);
  switch(test){
    case 'a':
      printf("%c is a vowel\n",test);
      break;
    case 'e':
      printf("%c is a vowel\n",test);
      break;
    case 'i':
      printf("%c is a vowel\n",test);
      break;
    case 'o':
      printf("%c is a vowel\n",test);
      break;
    case 'u':
      printf("%c is a vowel\n",test);
      break;
    default:
      printf("%c is a not a vowel\n",test);
  }
}

evenOdd.c

#include<stdio.h>
//if else statement example to test even and odd
int main(){
  int test;
  printf("Enter the value:");
  scanf("%d",&test);
  if(test%2==0){
    printf("%d is Even",test);
  }else{
    printf("%d is Odd",test);
  }
  return 0;
}

evenPrint.c

#include<stdio.h>
/* for loop and continue statement example
to print the even number from integer array */
int main(){
  int numbers[]={7,12,3,4,9,18,222};
  int size=sizeof(numbers)/sizeof(int);
  for(int i=0;i<size;i++){
    if(numbers[i]%2 != 0)
      //if number is odd, no printing
      continue;
    else
      printf("%d ",numbers[i]);
  }
  return 0;
}

factorial.c

#include<stdio.h>
//Compute the n factorial in iterative manner
int main(){
  int N,fact=1;
  printf("Enter the value of N:");
  scanf("%d",&N);
  for(int i=1;i<=N;i++){
    fact*=i;
  }
  printf("Factorial of %d! is %d\n",N,fact);
  return 0;
}

gcd.c

#include<stdio.h>
//Function prototype
int gcdFunction(int, int);
/* use of recursive function to compute gcd of 
two numbers using user defined function */
int main(){
  int a,b;
  printf("Enter value of a and b:");
  scanf("%d%d",&a,&b);
  //Function Call
  printf("gcd of %d and %d is %d\n",a,b,gcdFunction(a,b));
  return 0;
}
//Function Definition
int gcdFunction(int x,int y){
  if(x%y==0)
    return y;
  else
    return gcdFunction(y,x%y);
}

leapYear.c

#include<stdio.h>
//if-else if ladder example to find leap year
int main(){
  int year;
  printf("Enter the year:");
  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);
}