#include <stdio.h>

int main(void)

int movieChoice;
int seatNum;
int seatPlan[5][10] = { 0 };
int rows, cols;
char space;

void seatDisplay(int a[][10]);
void seatNew(int n[][10]);

void seatDisplay(int a[][10]) { //this function shows the seat plan

    for (int i = 0; i<5; i++) {
        for (int j = 0; j<10; j++) {
            cout << a[i][j];
            printf(" \n");
        }
    }
}

void seatNew(int n[][10]) { // this function shows the reserved seats

    for (int i = 0; i<5; i++) {
        for (int j = 0; j<10; j++) {
            cout << n[i][j];
            printf(" \n");
        }
    }

}

void seatRes(int x) {  //this function reserves the seats

    while (x>50 || x <= 0) {
        printf("Cannot process Reservation. ");
        printf("Please Enter number of seats to be reserved: ");
        scanf("%d", &seatNum);
    }
    printf("Please enter seat row and column you wish to reserve: \n");
    for (int i = 1; i <= x; i++) {
        printf("(row,column): ");
        scanf("%d %d %d", &rows, &space, &cols);
        seatPlan[rows][cols] = 1;
    }
}

int priceComp(int y) { //this function computes and displays the ticket price

    int price;
    price = y * 150;
    printf("You have reserved "  y  " seat(s).");
    printf("Ticket Price: ");
    return 0;
}

int main() { //this is the main function

    printf("Welcome to Movie World \n" );
    printf("1 - Movie 1 \n");
    printf("2 - Movie 2 \n");
    printf("3 - Movie 3 \n");
    printf("Enter your choice of Movie: ");
    scanf("%d", &movieChoice);

    switch (movieChoice) {

    case 1 :
        printf("Movie 1 \n");
        printf("Seating Reservation \n");
        seatDisplay(seatPlan);
        printf("How many seats would you like to reserve?: ");
        scanf("%d", &seatNum);
        seatRes(seatNum);
        printf("Seating Reservation \n");
        printf("1 marks your reserved seat \n");
        printf("------Movie 1 SEAT PLAN----------- \n");
        seatNew(seatPlan);
        priceComp(seatNum);
        break;

    case 2 :
        printf("Movie 2 \n" );
        printf("Seating Reservation \n");
        seatDisplay(seatPlan);
        printf("How many seats would you like to reserve?: ");
        scanf("%d", &seatNum);
        seatRes(seatNum);
        printf("Seating Reservation");
        printf("1 marks your reserved seat \n");
        printf("------Movie 2 SEAT PLAN----------- \n");
        seatNew(seatPlan);
        priceComp(seatNum);
        break;

    case 3 :
        printf("Movie 3 \n" );
        printf("Seating Reservation \n" );
        seatDisplay(seatPlan);
        printf("How many seats would you like to reserve?: ");
        scanf("%d", &seatNum);
        seatRes(seatNum);
        printf("Seating Reservation");

        printf("1 marks your reserved seat \n");
        printf("------Movie 3 SEAT PLAN----------- \n");
        seatNew(seatPlan);
        priceComp(seatNum);
        break;

    default:
        printf("Invalid Input \n");

    }
    return 0;
    getchar();
}

I'm studying C with converting C++ to C, but it doesn't moving.
I don't know C++ exactly but study it just for website.
I'm so thank you if you can help me, please...

You may like to try someting like this to get valid input and to prevent program crashing on accidental input of an invalid type.

#include <stdio.h>

#define ROWS 5
#define COLS 10
#define COST_PER_SEAT 150

/* Simple input of an integer...  i.e. NO range checking done */
int takeInInt( const char* prompt )
{
    int testInt;
    for( ; ; ) { /* an example of a C/C++ forever loop ... until 'return' */
        fputs( prompt, stdout );
        fflush( stdout );
        if( scanf( "%d", &testInt ) && getchar() == '\n' ) {
            return testInt;
        }
        /* else ...*/
        while( getchar() != '\n' ); /* 'flush' stdin ... as we go */
        puts( "Invalid input! Integers only please ..." );
    }
}

int takeInIntMinMax( const char* prompt, int min, int max )
{
    int testInt;
    for( ; ; ) { /* an example of a C/C++ forever loop ... until 'return' */
        fputs( prompt, stdout );
        fflush( stdout );
        if( scanf( "%d", &testInt ) && getchar() == '\n' ) {
            if( testInt >= min && testInt <= max ) {
                return testInt;
            } else {
                printf("Valid input range is %d..%d\n", min, max);
                continue;
            }
        }

        /* else ...*/
        while( getchar() != '\n' ); /* 'flush' stdin ... as we go */
        puts( "Invalid input! Integers only please ..." );
    }
}

void seatDisplay(int a[ROWS][COLS]) { /* this function shows the seat plan */
    int i, j;
    for (i = 0; i < ROWS; i++) {
        for (j = 0; j < COLS; j++) {
            printf( "%d ", a[i][j] );
        }
        putchar('\n');
    }
}

void seatRes(int x, int seatPlan[ROWS][COLS]) {  /* this function reserves the seats */
    int i, r, c;
    char space;
    while ( x > ROWS*COLS || x <= 0) {
        printf("Seats available  ");
        x = takeInInt("Please Enter number of seats to be reserved: ");
    }
    printf("Please enter seat row and column you wish to reserve: \n");
    for (i = 1; i <= x; i++) {
        printf("Re, seat %d (row,column): ", i);
        if( scanf("%d %c %d", &r, &space, &c) == 3 && getchar() == '\n' ) {
            if(r >= 0 && r < ROWS && c >= 0 && c < COLS ) {
                if( !seatPlan[r][c] ) {
                    seatPlan[r][c] = 1;
                }
                else {
                    printf( "That seat is already taken.\n" );
                    --i;
                }
            } else {
                printf( "Valid row, col is 0..%d, 0..%d.\n", ROWS-1, COLS-1 );
                --i;
            }
        }
        else {
            printf("Only integers are valid input here ... try again.\n");
            --i;
            while( getchar() != '\n' ); /* flush stdin ... */
        }
    }
}

void priceComp(int numSeats) { /* this function computes and displays the ticket price */

    int price = numSeats * COST_PER_SEAT;
    printf("You have reserved %d seat(s).\n", numSeats);
    printf("Ticket Price: %d\n", price );
}

void initAry( int a[ROWS][COLS] )
{
    int i, j;
    for (i = 0; i < ROWS; i++) {
        for (j = 0; j < COLS; j++) {
            a[i][j] = 0;
        }
    }
}

int main() {

    int movieChoice;
    int numSeatsRequested;
    int seatPlan[ROWS][COLS];
    initAry( seatPlan );

    printf("Seating Reservation \n");
    seatDisplay(seatPlan);

    printf("Welcome to Movie World \n" );
    printf("1 - Movie 1 \n");
    printf("2 - Movie 2 \n");
    printf("3 - Movie 3 \n");
    movieChoice = takeInIntMinMax("Enter your choice of Movie: ", 1, 3);

    printf("Movie %d \n", movieChoice );
    printf("Seating Reservation \n");
    numSeatsRequested = takeInIntMinMax("How many seats would you like to reserve? ", 1, ROWS*COLS);
    seatRes(numSeatsRequested, seatPlan);

    printf("Seating Reservation \n");
    printf("1 marks your reserved seat(s)) \n");
    printf("------Movie %d SEAT PLAN----------- \n", movieChoice );
    seatDisplay(seatPlan);

    priceComp(numSeatsRequested);

    return 0;
    getchar();
}