Question:Why we use do-while loop in c? Also tell any properties which you know? 

Answer It is also called as post tested loop. It is used when it is necessary to execute the loop at least one time. Syntax:
do {
Loop body
} while (Expression);
Example:
int main(){
    int num,i=0;
   
    do{
         printf("To enter press 1\n");
         printf("To exit press  2");
         scanf("%d",&num);
         ++i;
         switch(num){
             case 1:printf("You are welcome\n");break;
             default : exit(0);
         }
    }
    while(i<=10);
    return 0;
}
Output: 3 3 4 4

If there is only one statement in the loop body then braces is optional. For example:

(a)
int main(){
    double i=5.5678;
    do
         printf("hi");
    while(!i);
    return 0;
}
Output: 3 3 4 4

(b)
int main(){
    double i=5.63333;
    do
         printf("hi");
    while(!i);
    return 0;
}
Output: hi

(c)
int main(){
     int x=25,y=1;
     do
       if(x>5)
         printf(" ONE");
       else if(x>10)
         printf(" TWO");
       else if(x==25)
         printf(" THREE");
       else
         printf(" FOUR");
       while(y--);
return 0;
}
Output: ONE ONE 

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