conditional logic(2)

1:
 #include <stdio.h>
 ///***or condition
 int main()
 {
     int num =3;
     if(num >= 1 || num <= 10) {
         printf("yes\n");
     }
     else {
         printf("no\n");
     }
     return 0;
 }


output: yes

2:
 #include <stdio.h> 
///***and condition
 int main()  
 {  
     int num = -5;  
     if(num >= 1 && num <= 10) {  
         printf("yes\n");  
     }  
     else {  
         printf("no\n");  
     }  
     return 0;  
 }  

output: no

3:
 #include <stdio.h>
 ///***check upeer and lower case letter
 int main()
 {
     char ch = 'M';
     if(ch >= 'a' && ch <= 'z') {
         printf("It is lower case\n");
     }
     else if(ch >= 'A' && ch <= 'Z') {
         printf("It is upper case\n");
     }
     return 0;
 }




output: It is upper case