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typedef struct
{
char stu_num[12];
char name[10];
short int sex;//for 0 is female ,1 is male
char mobile_phone[12];
} stu_info;
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if(write(1,¡±hellloworld\n¡±,sizeof(¡°hellloworld\n¡±)) != sizeof(¡°hellloworld\n¡±))
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