Read 2 data string - c

Question

I have faced a problem with my program and I don't understand why. I read 2 data string and the program just skips the first read and jumps on the second one. I can't place the program here because is pretty big and I don't think anyone wants to waste time reading and understanding it.For example:
struct agenda {
char nume[20];
char prenume[20];
} vector[50];
void adaugare (){
printf("x=");
gets_s(vector[0].nume);
printf("y=");
gets_s(vector[0].prenume);
}
And when I build and run it, it only reads the second string.Edit:
struct agenda {
char nume[20];
char prenume[20];
}vector[50];
void adaugare();
void main() {
adaugare();
_getch();
}
void adaugare() {
int numar;
system("cls");
printf("\n\tCate contacte doriti sa adaugati? ");
scanf_s("%d", &numar);
for (int i = 0; i < numar; i++) {
printf("\nIntroduceti contactul %d\n", i);
printf("\tIntroduceti numele contactului %d: ", i);
gets_s(vector[i].nume);
printf("\tIntroduceti prenumele contactului %d: ", i);
gets_s(vector[i].prenume);
}
}
So in this case if you build and run it, it only reads the second string.

Answer 1

First thing you should elaborate what is gets_s() ? Is it your implementation of gets() or typo ? Instead of gets_s use fgets() to avoid buffering problem as mentioned in comments by #user3121023
// gets_s(vector[0].nume);
fgets(vector[0].nume,sizeof(vector[0].nume),stdin);
printf("y=");
// gets_s(vector[0].prenume);
fgets(vector[0].prenume,sizeof(vector[0].prenume),stdin);
EDIT(for visual c++) :
void adaugare() {
int numar;
system("cls");
printf("\n\tCate contacte doriti sa adaugati? ");
scanf_s("%d", &numar);
fflush(stdin);
for (int i = 0; i < numar; i++) {
printf("\nIntroduceti contactul %d\n", i);
printf("\tIntroduceti numele contactului %d: \n", i);
fflush(stdin);
gets_s(vector[i].nume);
printf("\tIntroduceti prenumele contactului %d: \n", i);
fflush(stdin);
gets_s(vector[i].prenume);
}
}
Because You must flush the input buffer(stdin) before using gets_s().
I hope it help's.