Hello, this is my first post, so I hope I don't come across negatively. I just started learning C programming language last week, so I am a complete newbie. I used to write basic scripts on mIRC about 8-10 years back, so i have a basic idea of what's going on. very basic...

I started watching these University lectures here and the students were given an assignment to take input from the user and output how a viking would say that number. Well, I figured I would try the same thing and here it is. I am traveling in Vietnam right now, so I thought it would be a good idea to just use vietnamese instead of viking.

The program is far from incomplete but I would like help on only one part for now. The If statement near the end is not working properly. When the program gets to that part, the variable is valid_entry is 1 and not 0, but it continues with the code as if it were 0. Thanks for your time and sorry i typed so much!

Code:
#include <stdio.h>



int main(void) {

	int number_input;                      //input from user.

	int greater_than_ten = 0;          //avoids duplicate names.

	int valid_entry = 0;                     //checks that the input is valid

	int complete = 0;                       //will cause the program to loop

	//char proceed_again = 'n';          //will allow to repeat translation.
	

	printf("Vietnamese Number Translator.\n\n");	

	printf("Type a number from 1-100. ");

	scanf("%d", &number_input);
			

	while ("complete == 0") {

		

		//check to make sure the number is between 1-100 

		if (number_input < 101 && number_input > 0) {

			valid_entry = 1;                 //skips the error

			complete = 1;                   //completes the translation

						

			printf("\n");

			printf("In Vietnamese, we say \"");

	

			//this section will calculate the numbers.

			//it will group the 10's place with the one's.

	

	

			//number 100

			if (number_input == 100)

				printf("mot tram\".\n");

	

			//for numbers 11-19

			if (number_input >10 && number_input <20) {            

				printf("muoi");     

				number_input = number_input - 10;

				}                                                             

	

			//for number 20    

			if (number_input == 20) {

				printf("hai muoi");

				number_input = number_input - 10;

				greater_than_ten = 1; 

			}                                                

                                                                                    

			//for numbers 21-30    

			if (number_input >20 && number_input <31) {                                                

				printf("hai muoi");                                                                      

				number_input = number_input - 20;                                                           

				greater_than_ten = 1; 

			}                                                                                   

	   

			//for numbers 31-40                            

			if (number_input >30 && number_input <41) {    

				printf("ba muoi");                          

				number_input = number_input - 30;

				greater_than_ten = 1;            

			}                                           

	                                               

			//for numbers 41-50                           

			if (number_input >40 && number_input <51) {   

				printf("bon muoi");                         

				number_input = number_input - 40;

				greater_than_ten = 1;           

			}                                          

	                                               

			//for numbers 51-60                           

			if (number_input >50 && number_input <61) {     

				printf("lam muoi");                           

				number_input = number_input - 50;

				greater_than_ten = 1;             

			}                                            

	 

			//for numbers 61-70                           

			if (number_input >60 && number_input <71) {   

				printf("sau muoi");                         

				number_input = number_input - 60;

				greater_than_ten = 1;           

			}                                          

	                                               

			//for numbers 71-80                          

			if (number_input >70 && number_input <81) {  

				printf("bay muoi");                        

				number_input = number_input - 70;

				greater_than_ten = 1;          

			}                                         

	                                               

			//for numbers 81-90                          

			if (number_input >80 && number_input <91) {  

				printf("tam muoi");

				number_input = number_input - 80;

				greater_than_ten = 1; 

			}



			//for numbers 91-99

			if (number_input >90 && number_input <100) {

				printf("chin muoi");

				number_input = number_input - 90;

				greater_than_ten = 1; 

			}



			//combines with previous section if needed.    

			if (number_input == 1)

				printf(" mot\".");



			if (number_input == 2)

				printf(" hai\".");



			if (number_input == 3)

				printf(" ba\".");



			if (number_input == 4)

				printf(" bon\".");



			if (number_input == 5)

				printf(" lam\".");



			if (number_input == 6)

				printf(" sau\".");



			if (number_input == 7)

				printf(" bay\".");



			if (number_input == 8)

				printf(" tam\".");



			if (number_input == 9)

				printf(" chin\".");



			if (number_input == 10 && greater_than_ten == 0)  //to avoid * muoi muoi for 

				printf("muoi\".");                                                  //numbers ending in 0.

    

			if (number_input == 10 && greater_than_ten == 1)  //needed to place a "."" at the   

				printf(".\"");                                                          //end of numbers ending in 0.

        

			printf("\n");                                                                   //will print a new line 			

         

		}  

		

		if ("valid_entry == 0") {

			//added just to test the values

			printf("v = %d c = %d n = %d", valid_entry, complete, number_input); 

			//

			printf("Sorry, please choose a number between 1-100. ");

			scanf("%d", &number_input);

		}	

	}

      

	return 0;

   

   }