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chapter1-4 C语言源程序 例1.1 #includestdio.h void main() { printf(Hello everyone\nStudy hard!\n); } 例1.2 #includestdio.h void main() { int x,y,sum;//define the variable printf(please input the first integer:\n);//display the prompt information scanf(%d,x);//input one integer printf(please input the second integer:\n);//display the prompt information scanf(%d,y);//input another integer sum=x+y;//caculate the sum printf(sum is %d\n,sum);//display the result } 例1.3 #includestdio.h double max(double a,double y) { double m; if(xy) m=x; else m=y; return m; } void main() { double a,b,c,t,maxdata; printf(please input three data:\n); scanf(%lf %lf %lf,a,b,c); t=max(a,b);/*调用函数max，求a、b之较大者*/ maxdata=max(t,c);/*调用函数max，求t、c之较大者*/ printf(the maximum data is :%lf\n,maxdata);/*输出最大值*/ } 第二章 //ASCII码与整数混用 #includestdio.h void main() { char b=a; int c; printf(a=%c\n,a); printf(a=%d\n,a); c=10*b; printf(c=%d\n,c); } //符号常量 #define PRICE 30 #includestdio.h void main() { int num,total; num=10; total=num*PRICE; printf(total=%d\n,total); } //数据长度 #includestdio.h void main() { int len_char,len_short,len_int,len_long,len_unsigned_short,len_unsigned_int,len_unsigned_long,len_float,len_double; len_char=sizeof(char); printf(char变量的数据长度为%d个字节\n,len_char); len_short=sizeof(short); printf(short变量的数据长度为%d个字节\n,len_short); len_int=sizeof(int); printf(int变量的数据长度为%d个字节\n,len_int); len_long=sizeof(long); printf(long变量的数据长度为%d个字节\n,len_long); len_unsigned_short=sizeof(unsigned short); printf(unsigned short变量的数据长度为%d个字节\n,len_unsigned_short); len_unsigned_int=sizeof(unsigned int); printf(unsigned int变量的数据长度为%d个字节\n,len_unsigned_int); len_unsigned_long=sizeof(unsigned long); printf(unsigned long变量的数据长度为%d个字节\n,len_unsigned_long); len_float=sizeof(float); printf(float变量的数据长度为%d个字节\n,len_float); len_double=sizeof(double); printf(double变量的数据长度为%d个字节\n,len_double); } //字符串常量 #includestdio.h void main() { char string[20]=I am a student of CJLU.; printf(%s\n,string); } /