姓名和成绩

#include "stdio.h"
#define N 45
int inputSS(char names[][20],int score[],int num);
void printSS(char names[][20],int score[],int num);
void getMAX(char names[][20],int score[],int num);
main()
{
    char names[N][20];
    int score[N];
    int num=0;
    int choose;
    printf("What do you want to do,Peter?\nInput(1),Output(2),Max(3),Exit(0):\n");
    scanf("%d",&choose);
    do{
    	switch(choose){
    		case 1:
    		num=inputSS(names,score,num);
    		break;
    		case 2:
    		printSS(names,score,num);
    		break;
    		case 3:
    		getMAX(names,score,num);
    	}
    	printf("\nWhat do you want to do,Peter?\nInput(1),Output(2),Max(3),Exit(0):");
    	scanf("%d",&choose);
    }while(choose!=0);
}
int inputSS(char names[][20],int score[],int num){
	int n,i;
	printf("How many students do you want to input?\n");
	scanf("%d",&n);
	if((n+num)>N || n<1){
		printf("Not valid sum\n");
		return num;
	}
	printf("Now input as (name score):\n");
	for(i=0;i<n;i++){
		printf("%d",i);
		scanf("%s %d",&names[i+num],&score[i+num]);
	}
	printf("Input is over\n");
	return num+n;
}
void printSS(char names[][20],int score[],int num){
	int i;
	if(num==0){
		printf("NO STUDENTS NOW\n");
		return;
	}
	printf("Now,the students score as follow:\n");
	for(i=0;i<num;i++)
	printf("%2d name:%10s score:%3d\n",i,names[i],score[i]);
}
void getMAX(char names[][20],int score[],int num){
	int i,max_index,max_score;
	if(num==0){
		printf("NO STUDENTS NOW\n");
		return;
	}
	max_index=0;
	max_score=score[0];
	for(i=1;i<num;i++)
	if(score[i]>max_score){
		max_score=score[i];
		max_index=i;
	}
	printf("The top score is %d by %s\n",score[max_index],names[max_index]);
}