#include float mul(float a, float b) printf(“请输入两个数:”) scanf(\%f%f\, &x, &y)

*极限俱乐部会员信息系统* #include \stdio h\ #include \string. h #define Len sizeof (struct staff) /自动求取staf结构的字节长度* struct staft char unit[601 char name[20]

#include void maino FILE ip char ch, str[20] if(fp= fopen(\e: Mname. txt\,\a+\)=NULL)/*以读取/追加方式打开文件name:txt* printf(\无法打开文件

#include #define null o FILE*fp; float f1 f2f3 if(fp=fopen(\e: paper. dat\, \wb\)NULL) printf\无法打开文件!mn\)

#include struct stu char name[10],/学生姓名* Int num,/学生编号*/ Int age;/*学生年龄* char addr[15];/*学生住址

#include #include void maino FILE* fp long i if(fp=fopen(\e: M\\alphabet txt\, rb\)=NULL printf(\文件打开时出错!in\)

#include void maino printf(\请输入变量x的值:\)

#include stdio. h\ #include\math. h' void maino c, P, xI, X2, real, imag printf(“请输入一元二次方程的三个系数:”); scanf(\%f%f%f\, &a, &b, &c)

#includestdio h float char oper printi“请输入两个数和一个四则运算符(如:3,+,2):”) scanf(\%f,%c, %f\, &operandi, &oper, &operand2 )

#include #includestime. h> void main( int i right=0, error int x, y, op, result, input srand(time(NULL))