printf
printf("%d,%03d,%03d\n",sum/1000000,(sum/1000)%1000,sum%1000);
%03d 輸出時位數不夠3位時,在左端補0;
%3d 輸出時 位數小於3的,則左端補以空格,若大於3,則按實際位數輸出;
Int a[100];
memset(a,0,sizeof(int)*100);
內存初始化函數,頭文件位#include<string.h>
開闢動態數組
Int *p = new int[len] ;
Delete[] p;
struct student
{
string name;
string number;
int grade;
};
student *stu = new student[n];
.......
...
delete[] stu;