If Condition Programs Set 7

Question:31
Write a C program to take input for a 4 digit number,calculate and print sum of odd digits?
Sol:

#include <stdio.h>
 int main()
 {
     int n,d1,d2,d3,d4,s=0;
     printf("Enter a 4 digit no ");
     scanf("%d",&n);
     if(n>=1000 && n<=9999)
     {
         d1=n%10;
         if(d1%2==1)
             s=s+d1;
         n=n/10;
         d2=n%10;
         if(d2%2==1)
             s=s+d2;
         n=n/10;
         d3=n%10;
         if(d3%2==1)
             s=s+d3;
         n=n/10;
         d4=n%10;
         if(d4%2==1)
             s=s+d4;
         printf("Sum of odd digits = %d",s);
     }
     else
         printf("Number is not a 4 digit no");
     return 0;
 }

Output:

case :1
Enter a 4 digit no 1234
Sum of odd digits = 4

case 2:
Enter a 4 digit no 1357
Sum of odd digits = 16

case 3:
Enter a 4 digit no 2365
Sum of odd digits = 8

Question:32
C program to take input for day number (1..7) and print the day?
for example:

input        output
1                Sun
2                Mon
3                Tue
4                Wed
5                Thru
6                Fri
7                Sat
Sol:

#include <stdio.h>
 int main()
 {
     int d;
     printf("Enter day no ");
     scanf("%d",&d);
     if(d==1)
         printf("Sun");
     else
         if(d==2)
         printf("Mon");
     else
         if(d==3)
         printf("Tue");
     else
         if(d==4)
         printf("Wed");
     else
         if(d==5)
         printf("Thru");
     else
         if(d==6)
         printf("Fri");
     else
         if(d==7)
         printf("Sat");
     else
         printf("Invalid day number");
     return 0;
 }

Output:

case 1:
Enter day no 5
Thru
case 2:
Enter day no 1
Sun
case 3:
Enter day no 15
Invalid day number

Question:33
Write a C program to take input for month number (1..12) and print the Month?

for example:
input        output
1               Jan
2               Feb
3               Mar
and so on
Sol:

#include <stdio.h>
 int main()
 {
     int m;
     printf("Enter month no ");
     scanf("%d",&m);
     if(m==1)
         printf("Jan");
     else
         if(m==2)
         printf("Feb");
     else
         if(m==3)
         printf("Mar");
     else
         if(m==4)
         printf("Apr");
     else
         if(m==5)
         printf("May");
     else
         if(m==6)
         printf("Jun");
     else
         if(m==7)
         printf("Jul");
     else
         if(m==8)
         printf("Aug");
     else
         if(m==9)
         printf("Sep");
     else
         if(m==10)
         printf("Oct");
     else
         if(m==11)
         printf("Nov");
     else
         if(m==12)
         printf("Dec");
     else
         printf("Invalid month number");
     return 0;
 }

Output:

case 1:
Enter month no 2
Feb
case 2:
Enter month no 1
Jan
case 3:
Enter month no 10
Oct
case 4:
Enter month no 15
Invalid month number

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