C language reading data

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;

int main()
{
    
	// Here is the write data , The digital 0~9 Write to data.txt In file 
	FILE *fpWrite1=fopen("out1.txt","w");
	FILE *fpWrite2=fopen("out2.txt","w");
	FILE *fpRead2=fopen("input2.txt","r");
	FILE *fpRead3=fopen("input3.txt","r");
	int flag=0;
	while(1){
    
		char a[1000];
		int res=fscanf(fpRead2,"%s",a);
		if(res == EOF)
			break;
		for(int j=0;a[j]!='\0';j++){
    
			if(a[j]!=','){
    
				fprintf(fpWrite1,"%c",a[j]);
			// printf("%c",a[j]);
				flag=1;
			}else{
    
				if(flag==1){
    
					fprintf(fpWrite1,"%c",'\n');
				// printf("\n");
					flag=0;	
				}	
			}
		}
		if(flag==1){
    
		// printf("\n");
			fprintf(fpWrite1,"%c",'\n');	
			flag=0;
		}
	}
	flag=0;
	while(1){
    
		char a[1000];
		int res=fscanf(fpRead3,"%s",a);
		if(res == EOF)
			break;
		for(int j=0;a[j]!='\0';j++){
    
			if(a[j]!=','){
    
				fprintf(fpWrite2,"%c",a[j]);
			// printf("%c",a[j]);
				flag=1;
			}else{
    
				if(flag==1){
    
					fprintf(fpWrite2,"%c",'\n');
				// printf("\n");
					flag=0;	
				}	
			}
		}
		if(flag==1){
    
		// printf("\n");
			fprintf(fpWrite2,"%c",'\n');	
			flag=0;
		}
	}
	fclose(fpWrite1);
	fclose(fpWrite2);
	fclose(fpRead2);
	fclose(fpRead3);
	FILE *fpRead1=fopen("input1.txt","r");
	FILE *fpRead_2=fopen("out1.txt","r");
	FILE *fpRead_3=fopen("out2.txt","r");
	FILE *fpWrite3=fopen("out3.txt","w");
	int max=0;
	while(1){
     
		char a[100];
		int res1=fscanf(fpRead1,"%s",a);
		int s=0;
		for(int j=0;a[j]!='\0';j++){
    
			s=s*10+(a[j]-'0');
		}
		if(s>max)
			max=s;
		if(res1 == EOF )
			break;
	}
	fclose(fpRead1);
	printf(" The maximum number of people is ：%d people \n",max);
	FILE *fpRead_1=fopen("input1.txt","r");
	char sfz[20]=" ";
	while(1){
     
		char a[100];
		char b[1000];
		char c[1000];
		int res1=fscanf(fpRead_1,"%s",a);
		int s=0;
		for(int j=0;a[j]!='\0';j++){
    
			s=s*10+(a[j]-'0');
		}
		
		if(res1 == EOF )
			break;
		for(int i=0;i<s;i++){
    
			int res2=fscanf(fpRead_2,"%s",b);
			int res3=fscanf(fpRead_3,"%s",c);
			fprintf(fpWrite3,"%s",b);
			fprintf(fpWrite3,"%c",',');
			fprintf(fpWrite3,"%s",c);
			if(i!=max-1)
				fprintf(fpWrite3,"%c",',');
		}
		for(;s<max;s++){
    
			fprintf(fpWrite3,"%s"," ");
			fprintf(fpWrite3,"%c",',');	
			fprintf(fpWrite3,"%s",sfz);
			if(s!=max-1)
				fprintf(fpWrite3,"%c",',');	
		}
			
		fprintf(fpWrite3,"%c",'\n');
	}
	fclose(fpWrite3);
	fclose(fpRead_1);
	fclose(fpRead_2);
	fclose(fpRead_3);
	return 0;
}