C语言程序设计(第3版)P143页小学生计算机辅助教学系统

任务1

#include
#include
#include
int main()
{
	int m,n,counter=0,p,x;
	srand(time(NULL));
	m=rand()%10+1;
	n=rand()%10+1;
	do{
		p=m*n;
		printf("%d*%d=?\n",m,n);
		scanf("%d",&x);
		if(p==x)
			printf("Right!\n");
		if(p!=x)
		{
			printf("Wrong! Please try again.\n");
		}
	}while(x!=p);

	return 0;
}

任务2

#include
#include
#include
int main()
{
	int m,n,counter=0,p,x;
	srand(time(NULL));
	m=rand()%10+1;
	n=rand()%10+1;
	do{
		p=m*n;
		printf("%d*%d=?\n",m,n);
		scanf("%d",&x);
		if(p==x)
			printf("Right!\n");
		if(p!=x)
		{
			counter++;
			if(counter<=2)
			{
				printf("Wrong! Please try again.\n");
			}
			else
				printf("Wrong!You have tried three times! Test over!\n");
		}
	}while(x!=p&&counter<3);

	return 0;
}

任务三

#include
#include
#include
int main()
{
	int m,n,counter=0,p,x;
	float l=0,k;
	srand(time(NULL));
	do{
		m=rand()%10+1;
		n=rand()%10+1;
		p=m*n;
		printf("%d*%d=?\n",m,n);
		scanf("%d",&x);
		counter++;
		if(p==x)
		{
			l++;
			printf("Right!\n");
		}
		if(p!=x)
		{
			printf("Wrong!\n");
		}
	}while(counter<10);
	k=100*(float(l)/10);
	printf("正确率:%.f%%\n",k);

	return 0;
}

任务四

#include
#include
#include
int main()
{
	system("color 5F");
	int m,n,counter=0,p,x,y,t,term,v;
	float l=0,k;
	char h;
	srand((unsigned)time(NULL));
	srand(time(NULL));

	do{
		t=rand()%4;
		m=rand()%10+1;
		n=rand()%10+1;
		if(t==0)
		{
			h='+';
			p=m+n;
		}
		if(t==1)
		{
			h='-';
			if(m=0)
					v=0;
			}
		}while(v==1);
		counter++;
		if(p==x)
		{
			l++;
			printf("Right!\n");
		}
		if(p!=x)
		{
			printf("Wrong!\n");
		}
	}while(counter<10);
	k=100*(float(l)/10);
	printf("正确率:%.f%%\n您的分数为%.f\n",k,k);
	return 0;
}

任务五

#include
#include
#include
int main()
{
	system("color 5F");
	int m,n,counter=0,p,x,y,t,term,v;
	float l=0,k;
	char h;
	srand((unsigned)time(NULL));
	srand(time(NULL));
	do{
		do{
			t=rand()%4;
			m=rand()%10+1;
			n=rand()%10+1;
			if(t==0)
			{
				h='+';
				p=m+n;
			}
			if(t==1)
			{
				h='-';
				if(m=0)
						v=0;
				}
			}while(v==1);
			counter++;
			if(p==x)
			{
				l++;
				printf("Right!\n");
			}
			if(p!=x)
			{
				printf("Wrong!\n");
			}
		}while(counter<10);
		k=100*(float(l)/10);
		printf("正确率:%.f%%\n您的分数为%.f\n",k,k);
		counter=0,l=0;
		if(k<75)
			printf("您的正确率不到75%%,请在做一遍.\n");
	}while(k<75);
	return 0;
}

任务六

#include
#include
#include
int main()
{
	system("color 5F");
	int m,n,counter=0,p,x,y,t,term,v;
	float l=0,k;
	char h;
	srand((unsigned)time(NULL));
	srand(time(NULL));
	do{
		do{
			t=rand()%4;
			m=rand()%10+1;
			n=rand()%10+1;
			if(t==0)
			{
				h='+';
				p=m+n;
			}
			if(t==1)
			{
				h='-';
				if(m=0)
						v=0;
				}
			}while(v==1);
			counter++;
			if(p==x)
			{
				l++;
				if(t==0)
					printf("Very good!\n");
				if(t==1)
					printf("Excellent!\n");
				if(t==2)
					printf("Nice work!\n");
				if(t==3)
					printf("Keep up the good work!\n");
			}
			if(p!=x)
			{
				if(t==0)
					printf("No.Please try again.\n");
				if(t==1)
					printf("Wrong.Try once more.\n");
				if(t==2)
					printf("Don't give up\n");
				if(t==3)
					printf("Not correct.Keep trying.\n");
			}
		}while(counter<10);
		k=100*(float(l)/10);
		printf("正确率:%.f%%\n您的分数为%.f\n",k,k);
		counter=0,l=0;
		if(k<75)
			printf("您的正确率不到75%%,请在做一遍.\n");
	}while(k<75);
	return 0;
}