printf
printf("%d,%03d,%03d\n",sum/1000000,(sum/1000)%1000,sum%1000);
%03d 输出时位数不够3位时,在左端补0;
%3d 输出时 位数小于3的,则左端补以空格,若大于3,则按实际位数输出;
Int a[100];
memset(a,0,sizeof(int)*100);
内存初始化函数,头文件位#include<string.h>
开辟动态数组
Int *p = new int[len] ;
Delete[] p;
struct student
{
string name;
string number;
int grade;
};
student *stu = new student[n];
.......
...
delete[] stu;