If Condition Programs Set 8

Question:34
C program to take input student details like rollno, name, marks of three subjects (m1,m2,m3). Calculate and print total and per. Also print the grade based on the given conditions:
condition Grade
if(per>=90)                             A+
if(per>=80 and per<90)       A
if(per>=70 and per<80)       B+
if(per>=60 and per<70)       B
if(per>=50 and per<60)       C
if(per>=40 and per<50)       D
if(per<40)                               F
Sol:

#include <stdio.h>
 int main()
 {
     int roll;
     char name[20];
     float m1,m2,m3,total,per;
     printf("Enter roll no ");
     scanf("%d",&roll);
     printf("Enter name ");
     scanf("%s",name);
     printf("Enter marks of m1,m2 and m3 ");
     scanf("%f %f %f",&m1,&m2,&m3);
     total=m1+m2+m3;
     per=total/3;
     printf("Total = %.3f  Per = %.2f\n",total,per);
     if(per>=90)
         printf("Grade : A+");
     else
         if(per>=80 && per<90)         
          printf("Grade : A");     
      else         
         if(per>=70 && per<80)         
          printf("Grade : B+");     
       else         
          if(per>=60 && per<70)         
           printf("Grade : B");     
        else         
           if(per>=50 && per<60)         
            printf("Grade : C");     
         else         
            if(per>=40 && per<50)
            printf("Grade : D");
         else
            printf("Grade : F");
 return 0;
 }

Output:

Enter roll no 101
Enter name Amit
Enter marks of m1,m2 and m3 98
97
95
Total = 290.000 Per = 96.67
Grade : A+

Question:35
C program to take input for 2 numbers and an operator(+,-,*,/). Based on the entered operator calculate and print the result?
Sol:

#include <stdio.h>
 int main()
 {
     float a,b,c;
     char op;
     printf("Enter 2 nos ");
     scanf("%f %f",&a,&b);
     printf("Enter the operator (+,-,*,/) ");     
     fflush(stdin);     
     scanf("%c",&op);     
     if(op=='+')     
     {         
         c=a+b;         
         printf("Sum = %f",c);     
     }     
     else         
        if(op=='*')
     {
         c=a*b;
         printf("Prod = %f",c);
     }
     else
         if(op=='-')
     {
         if(a>b)
             c=a-b;
         else
             c=b-a;
         printf("Diff = %f",c);
     }
     else
         if(op=='/')
     {
         c=a/b;
         printf("Div = %f",c);
     }
     else
         printf("Invalid operator");
     return 0;
 }

Output:

case 1:

Enter 2 nos 10
20
Enter the operator (+,-,*,/) +
Sum = 30.000000

case 2:

Enter 2 nos 10
20
Enter the operator (+,-,*,/) *
Prod = 200.000000

case 3:

Enter 2 nos 50
5
Enter the operator (+,-,*,/) /
Div = 10.000000

case 4:

Enter 2 nos 25
6
Enter the operator (+,-,*,/) –
Diff = 19.000000

case 5:

Enter 2 nos 25
6
Enter the operator (+,-,*,/) )
Invalid operator


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