純抄練習:

引數值互換 -- ES_C_EXP602

//最常用方法
#include <stdio.h>

int main() {
	int x=3,y=6;
	int z;
	z=x;
	x=y;
	y=z;
	printf("x= \n",x);
	printf("y= \n",y);
	return 0;
}
//x=
//y=
//問題是除錯不出來啊,我是輸出寫錯了嗎


//不需要第三者
#include <stdio.h>

int main() {
	a+=b;
	a-=b=a-b;
	printf("a= \n",a);
	printf("b= \n",b);
	return 0;
}
 

//第二種,巨集定義時,讓巨集的引數互換
#define A(a,b,k) k=b;b=a;a=k;
main()
{
	double x,y,z;
	printf("please input x=");
	scanf("%lf",&x);
	printf("please input y=");
	scanf("%lf",&y);
	A(x,y,z)
	printf("x`=%.1lf y`=%.1lf",x,y);
	getch();
}
//執行不出來,我水平還是太低了吧

加法考試題 -- ES_C_EXP603

//雖然這和題目要求不符合但是我還是要寫,我天終於有一個自己寫的不報錯了,好心酸
#include <stdio.h>

int main() {
	int a=2,b=3;
	int sum = 0;
	printf("\n2+3=");
	scanf("%d",&sum);
	if(sum > (a+b)) {
		printf("You entered %d which is bigger!",sum);
	} else if(sum <(a+b)) {
		printf("You entered %d which is smaller!",sum);
	} else {
		printf("You entered %d which is right!",sum);
	}
	return 0;
}
//按照題目寫else if不等於a+b,用!=,輸出還是right
 

階乘求和 -- ES_C_EXP604

#include <stdio.h>

int main() {
	int a=1,b=2,c=3;
	int longsum;
	longsum = a*b*c;
	printf("int a,int b,int c:1,2,3 \n");
	printf("longsum= %d\n",longsum);
	return 0;
}

 隨機數求和 -- ES_C_EXP605

 課程平均成績 -- ES_C_EXP606

沒有答案要瘋了……

1

//輸入兩個整數，求兩數的平方和並輸出。
#include <stdio.h>

int main() {
	int a,b,s;
	printf("please input a,b:\n");
	scanf("%d%d",&a,&b);
	s=a*a+b*b;
	printf("the result is %d\n",s);
}
 

2