if-else

1. Program to find largest number between two numbers.

   #include<stdio.h>
   int main(){
     int n1,n2;
     scanf("%d%d",&n1,&n2);
     if(n1>n2)
       printf("%d is largest",n1);
     else
       printf("%d is largest",n2);
     return 0;
   }
   

   Sample Input
   7 9
   Sample Output
   9 is largest
   

2. Program to find largest number between three numbers.

   #include<stdio.h>
   int main(){
     int n1,n2,n3;
     scanf("%d%d%d",&n1,&n2,&n3);
     if(n1>n2 && n1>n3)
       printf("%d is largest",n1);
     else if(n2>n3)
       printf("%d is largest",n2);
     else
       printf("%d is largest",n3);
     return 0;
   }
   

   Sample Input
   5 3 4
   Sample Output
   5 is largest
   

3. Program to find second largest number between three numbers.

   #include<stdio.h>
   int main(){
     int n1,n2,n3;
     scanf("%d%d%d",&n1,&n2,&n3);
     if(n1>n2 && n1>n3){
       if(n2>n3)
         printf("%d is second largest.",n2);
       else
         printf("%d is second largest.",n3);
     }else if(n2>n1 && n2>n3){
       if(n1>n3)
         printf("%d is second largest.",n1);
       else
         printf("%d is second largest.",n3);
     }else if(n3>n1 && n3>n2){
       if(n1>n2)
         printf("%d is second largest.",n1);
       else
         printf("%d is second largest.",n2);
     }
     return 0;
   }
   

   Sample Input
   9 5 7
   Sample Output
   7 is second largest.
   

4. Program to check whether the given number is positive, negative or zero.

   #include<stdio.h>
   int main(){
     int n;
     scanf("%d",&n);
     if(n==0)
       printf("Given number is zero.");
     else if(n>0)
       printf("Given number is positive.");
     else
       printf("Given number is negative.");
     return 0;
   }
   

   Sample Input
   5
   Sample Output
   Given number is positive.
   

5. Program to print wishes according to the time given in hours.

   #include<stdio.h>
   int main(){
     int hours;
     scanf("%d",&hours);
     if(hours>=6 && hours<12){
       printf("Good Morning");
     }else if(hours>=12 && hours<16){
       printf("Good Afternoon");
     }else if(hours>=16 && hours<20){
       printf("Good Evening");
     }else if(hours>=20 && hours<24 || hours>=0 && hours<6){
       printf("Good Night");
     }else{
       printf("Invalid Time");
     }
     return 0;
   }
   

   Sample Input
   9
   Sample Output
   Good Morning
   

6. Program to check whether given alphapet is vowel or consonant.

   #include<stdio.h>
   int main(){
     char ch;
     scanf("%c",&ch);
     if(ch>='A'&&ch<='Z' || ch>='a'&&ch<='z'){
       if(ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u'|| ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U')
         printf("Given character is vowel");
       else
         printf("Given character is consonant");
     }else{
       printf("Given character is not an alphabet");
     }
     return 0;
   }
   

   Sample Input
   G
   Sample Output
   Given character is consonant
   

7. Program to check whether given character is alphabet, digit or symbol.

   #include<stdio.h>
   int main(){
    char ch;
    scanf("%c",&ch);
    if(ch>='A'&&ch<='Z' || ch>='a'&&ch<='z'){
     printf("Given character is an alphabet.");
    }else if(ch>='0'&&ch<='9'){
     printf("Given character is digit.");
    }else{
     printf("Given character is symbol.");
    }
    return 0;
   }
   

   Sample Input
   @
   Sample Output
   Given character is symbol.
   

8. Write a program to input marks of five subjects Physics, Chemistry, Biology, Mathematics and Computer. Calculate percentage and grade according to following:
   Percentage >= 90% : Grade A
   Percentage >= 80% : Grade B
   Percentage >= 70% : Grade C
   Percentage >= 60% : Grade D
   Percentage >= 40% : Grade E
   Percentage < 40% : Grade F
   

   #include<stdio.h>
   int main(){
     int s1,s2,s3,s4,s5,percent;
     scanf("%d%d%d%d%d",&s1,&s2,&s3,&s4,&s5);
     percent = ((float)(s1+s2+s3+s4+s5)/500)*100;
     if(percent>=90){
       printf("Grade - A");
     }else if(percent>=80){
       printf("Grade - B");
     }else if(percent>=70){
       printf("Grade - C");
     }else if(percent>=60){
       printf("Grade - D");
     }else if(percent>=50){
       printf("Grade - E");
     }else{
       printf("Fail");
     }
     return 0;
   }
   

   Sample Input
   54 47 85 70 66
   Sample Output
   Grade - D