1. Write a program in c to find greatest number between three numbers.

            #include<stdio.h>
            #include<conio.h>
                 
                int main()
                {
                    int num1, num2, num3;
                 
                    printf("enter first no: ", num1);
                    scanf("%d", &num1);
                
                    printf("enter second no: ", num2);
                    scanf("%d", &num2);
                
                    printf("enter third no: ", num3);
                    scanf("%d", &num3);
                
                
                    if (num1 > num2)
                    {
                        if (num1 > num3)
                        {
                            printf("%d is greatest num.", num1);
                        }
                        else
                        {
                           printf("%d is greatest num.", num3);
                        }
                    }
                    else if (num2 > num3)
                        printf("%d is greatest num.", num2);
                    else
                        printf("%d is greatest num.", num3);
                
                        return 0;
                }
        

Run

2. Write a program in c to find odd & even number.

        #include <stdio.h>
            int main() {
                int num;
                printf("enter integer no: ");
                scanf("%d", &num);
            
                if(num % 2 == 0) {
                    printf("%d is even.", num);
                } else {
                    printf("%d is odd.", num);
                }
                
                return 0;
            }

     

3. Write a program in c to check entered number is positive or negative.

        #include <stdio.h>
 
            void main()
            {
                int number;
             
                printf("enter a no: ");
                scanf("%d", &number);

                if (number >= 0) {
                    printf("%d is a positive number \n", number);
                 } else {
                    printf("%d is a negative number \n", number);
                 }
            }

    

4. Write a program in c to enter year and check input year is leap year or not.

    #include <stdio.h>

        int main()
        {
            int year;
        
            printf("enter year : ");
            scanf("%d", &year);
        
        
            if(year % 4 == 0)
            {
                printf("leap year");
            }
            else
            {
                printf("genral year");
            }
        
            return 0;
        }

     

5. Write a program in c to check that give character is vowel or consonant.

        #include <stdio.h>

            int main()
            {
                char chr;
            
                printf("enter char: ");
                scanf("%c", &chr);
            
            
                if(chr == 'a' || chr == 'A' || chr == 'e' || 
                   chr == 'E' || chr == 'i' || chr == 'I' || 
                   chr == 'o' || chr == 'O' || chr == 'u' || chr == 'U' )
                {
                    printf("char is vovel.");
                }
                else
                {
                    printf("char is consonant");
                }
            
                return 0;
            }

     

6. Write a program in c to input a character and check character is in uppercase or in lowercase.

            
        #include<stdio.h>
 
    int main() {
       char chr;
     
       printf("\nEnter The Character : ");
       scanf("%c", &chr);
     
       if (chr >= 'A' && chr <= 'Z')
          printf("Character is Upper Case ");
       else
          printf("Character is  Lower Case ");
     
       return (0);
    }

     

7. Write a program in c to find greatest number between four number using ternary operator.

     
#include <stdio.h> 

  int main() 
  { 
      int n1, n2, n3, n4, max; 

       printf("enter 1st no: ");
       scanf("%d",&n1);

       printf("enter 2nd no: ");
       scanf("%d",&n2);

       printf("enter 3rd no: ");
       scanf("%d",&n3);

       printf("enter 4th no: ");
       scanf("%d",&n4);
        
      max = (n1 > n2 && n1 > n3 && n1 > n4) ?  
                                     n1 :  
                                       ((n2 > n3 && n2 > n4) ?  
                                                           n2 :  
                                                            (n3 > n4 ? n3 : n4)); 
        
      printf("Largest number is %d.", max); 
    
      return 0; 
  }
   

9. Write a program in C to print week day according to day number.

        #include<stdio.h>
     
            int main()
                {
                   
                    int day;
        
                    printf("enter day no: ");
                    scanf("%d",&day);
                   
                    
                    switch (day)
                    {
                    case 1:
                        printf("Monday");
                        break;
        
                    case 2:
                        printf("Tuesday");
                        break;
        
                    case 3:
                        printf("Wednesday");
                        break;
        
                     case 4:
                        printf("Thirsday");
                        break;
        
                    case 5:
                        printf("Friday");
                        break;
        
                    case 6:
                        printf("Sturday");
                        break;
        
                    case 7:
                        printf("Sunday");
                        break;
                    
                    default:
                        printf("Defaul day no.");
                        break;
                    }
                
                        return 0;
                }        

     

10. Write a program in c to calculate mathematical operations using switch case.

    #include<stdio.h>
    #include<conio.h>
         
    int main()
        {
           
            int num1, add, mul, sub;
            char oprator;
            float num2, div;

            printf("enter oprator: ",oprator);
            scanf("%c",&oprator);
           
            printf("enter first no: ");
            scanf("%d",&num1);

            printf("enter second no: ");
            scanf("%f", &num2); 

            add = num1 + num2;
            sub = num1 - num2;
            mul = num1 * num2;
            div = num1 / num2;

            switch (oprator)
            {
            case '+':
                printf("addition is: %d", add);
                break;

            case '-':
                printf("subtretion is: %d", sub);
                break;

            case '*':
                printf("multiplication is: %d", mul);
                break;

            case '/':
                printf("division is: %f", div);
                break;
            
            default:
                printf("default oprator.");
                break;
            }
        
                return 0;
        }

  

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