Problems Starting C Programs -

i'm trying execute code below. however, in eclispe, program doesn't start until enter character , press enter. instance, if hit run, have enter number represent age before asks me enter age. wondering how fix this.

int main() {          int age;                          /* need variable... */          printf( "please enter age" );  /* asks age */         scanf( "%d", &age );                 /* input put in age */         if ( age < 100 ) {                  /* if age less 100 */             printf ("you pretty young!\n" ); /* show works... */         }         else if ( age == 100 ) {            /* use else show example */              printf( "you old\n" );                }         else {             printf( "you old\n" );     /* executed if no other statement */         }         return 0; } 

this pretty classic problem. output stream has not been flushed. happens after writing newline (which not doing). if don't want newline, issue hard flush on standard out:

printf( "please enter age" ); fflush( stdout );  scanf( "%d", &age ); 

while i'm here, can ask think commenting style? commenting every line of code excessive. can read code understands each line does, without needing comment. put comments on own line, , give overview of several lines of code. prefer see quick overview of i'm read know whether bother reading or not.