c语言处理excel表格_c语言一般文件的处理过程

	FILE *fp ;
	fp = fopen("./test.csv","w") ; // 写 
	for (i=0 ; i<4 ; i++)
		fprintf(fp,"%c,%d,%d\n", chy[i], data[i], d2) ;
	fclose(fp);

#include<bits/stdc++.h> 
#define num 20
using namespace std;

void writeExcel()
{ 
   
	char chy[4]={ 
    'x' ,'a' ,'h','w' }, ch, t;
	int data[4]={ 
    1 , 3 , 6 ,9	}, d1 = -1, d2 = 5;
	int i ;
	FILE *fp ;
	fp = fopen("./test.csv","w") ; // 写 
	for (i=0 ; i<4 ; i++)
		fprintf(fp,"%c,%d,%d\n", chy[i], data[i], 5) ;
	fclose(fp);
	
	cout << "读：" << endl; 
	fp = fopen("./test.csv","r") ; // 读 
	cout << "d1 = " << d1 << endl;
	cout << "ftell(fp) = " << ftell(fp) << endl;
	fseek(fp, 0L, 2); // 末尾 
	cout << "ftell(fp) = " << ftell(fp) << endl << endl;
	
	fseek(fp, -3L, 1); // 向前移动 3L 
	cout << "ftell(fp) = " << ftell(fp) << endl;
	fscanf(fp, "%d", &d1); // 5
	cout << d1 << endl;
	cout << "ftell(fp) = " << ftell(fp) << endl << endl;
	
	fseek(fp, -3L, 1);
	cout << "ftell(fp) = " << ftell(fp) << endl;
	fscanf(fp, "%d", &d1); // 9
	cout << d1 << endl;
	cout << "ftell(fp) = " << ftell(fp) << endl<< endl;
	
	fscanf(fp, "%c", &ch); // 9后面的',' 
	cout << ch << endl;
	cout << "ftell(fp) = " << ftell(fp) << endl<< endl;
	
	fseek(fp, -4L, 1);
	cout << "ftell(fp) = " << ftell(fp) << endl;
	fscanf(fp, "%c", &ch); // w 
	cout << ch << endl;
	cout << "ftell(fp) = " << ftell(fp) << endl<< endl;
	
	fclose(fp);
}

int  main()
{ 
   					
	writeExcel()  ;	
	
	system("pause"); 
	return 0;
}

fscanf(fp, "%c,%d,%d\n", &ch, &d1, &d2);

fscanf(fp, "%d\n", &d2);
fseek(fp, -3L, 1);//从当前位置 向着开头的方向移动3L字节
fscanf(fp, "%d\n", &d2);