Main Menu choice prompt is gathered even on sub Function scanf (C) -

im creating program has main menu linked couple of other functions. main menu code

int main(){   int imenuchoice,exit;  imenuchoice=0;  exit =1;   while (exit !=0){   system("cls");   printf("**********main menu************\n");   printf("*1) cartesian plane           *\n");   printf("*2) number words           *\n");   printf("*3) b          *\n");   printf("*4) c   *\n");   printf("*5) d        *\n");   printf("*6) e        *\n");   printf("*7) exit                      *\n");   printf("*******************************\n");   scanf("%d",&imenuchoice);    switch (imenuchoice) {             case 1:                 cartisian();                 break;             case 2:                 num2word();                 break;             case 3:                                  break;             case 4:                                  break;             case 5:                                  break;             case 6:                 break;             case 7:                 system("cls");                 printf("\n\nthank using our program\n\n ");                 exit = 0;                 break;             default:                 break;         }   }   getche(); } 

so test number words function prompts user input (int). when enter number, function ask number (no printf prompt _ waits number input), lets call mystery number x.

after function done converting number, program go main menu split second , automatically goes function.

i realized mystery number x somehow being used advance menu input! dont know did wrong.

here code num2word function.

int num2word() {      int iwor,iones,itens,ihundred,ithousand;     system("cls");     printf("enter number(max 3000)\n");     scanf("%i \n",&iwor);      if(iwor<=3001)     {     iones=iwor%10;     iwor=iwor/10;     itens=iwor%10;     iwor=iwor/10;     ihundred=iwor%10;     iwor=iwor/10;     ithousand=iwor%10;      thousand(ithousand);     hundred(ihundred);     if(itens!=1)     {         tenty(itens);         ones(iones);     }     if(itens==1)     exception(iones);     }     else{     printf("beyond 3000");     }     getche();     return 0; } 

the tenty,ones, hundredth , thousandths use switch, same structure code below:

int ones(int x) {     if(x!=0){     switch(x)     {         case 1:         printf("one");         break;         case 2:         printf("two");         break;         case 3:         printf("three");         break;         case 4:         printf("four ");         break;         case 5:         printf("five");         break;         case 6:         printf("six");         break;         case 7:         printf("seven");         break;         case 8:         printf("eight");         break;         case 9:         printf("nine");         break;         default:         break;     } }     return; } 

since cant post images yet ill try show how function output looks like

---

enter number (max 3000):
619

//i press enter here , nothing happens
3 //i must input number show conversion, in case number 3.

six hundred nineteen

after this, itll go main menu split sec , go straight main() switch(imenuchoice) case 3.

there's no mystery number x or ghost :)

change

scanf("%i \n",&iwor);  

to

scanf("%i",&iwor); 

the whitespace characters have in format string of scanf, ignores whitespace characters. that's why forced input non-whitespace character.