中M2021秋C、Java入门练习第I段——变量、表达式、分支、循环1~20题

中M2021秋C、Java入门练习第I段——变量、表达式、分支、循环（1~20题）

7-1 重要的话说三遍 (5 分)

 #include
int main() {
    int i;
    for(i=0;i<3;i++)
    printf("I'm gonna WIN!n");
    return 0;
    }

7-2 I Love GPLT (5 分)

#include
int main() {
    printf("In nLnonvnen nGnPnLnT");
    return 0;
    }

7-3 输出带框文字 (5 分)

#include
int main() {
    printf("************n");
    printf("  Welcomen");
    printf("************n");
    return 0;       
}

7-4 输出菱形图案 (5 分)

#include
int main() {
    printf("  An");
    printf("A   An");
    printf("  An");
    return 0;    
}

7-5 输出倒三角图案 (5 分)

#include
int main() {
    printf("* * * *n");
    printf(" * * *n");
    printf("  * *n");
    printf("   *n");
    return 0;    
}

7-6 厘米换算英尺英寸 (15 分)

#include 
int main() {
	int f, i, cm;
	double I, P;
	scanf("%d", &cm);
	I = cm / 30.48;
	f = I / 1;
//	printf("%d", f);
	P = (I - f) * 12;
	i = P / 1;
	printf("%d %d", f, i);
	return 0;
}

7-7 计算摄氏温度 (10 分)

int main() {
	int F, C;
	scanf("%d", &F);
	C = 5 * (F - 32) / 9;
	printf("Celsius = %d", C);
	return 0;
}

7-8 是不是太胖了 (5 分)

#include 

int main() {
	int H;
	float W;
	scanf("%d", &H);
	W = (H - 100) * 0.9 * 2.0;
	printf("%.1f", W);
	return 0;

}

7-9 求整数均值 (10 分)

#include 

int main() {
	int Sum, a, b, c, d ;
	float Average ;
	scanf("%d%d%d%d", &a, &b, &c, &d);
	Sum = a + b + c + d;
	Average = Sum / 4.0;
	printf("Sum = %d; Average = %.1f", Sum, Average);
	return 0;
}

7-10 算术入门之加减乘除 (10 分)

#include 

int main() {
	int a, b;
	scanf("%d%d", &a, &b);
	printf("%d + %d = %dn", a, b, a + b);
	printf("%d - %d = %dn", a, b, a - b);
	printf("%d * %d = %dn", a, b, a * b);
	if (a % b == 0) 
		printf("%d / %d = %dn", a, b, a / b);
	else 
		printf("%d / %d = %.2fn", a, b, a / (double)b);
	return 0;
}

7-11 计算平均分 (5 分)

#include
int main()
{
    int m,e,c,ave;
    m=87;
    e=72;
    c=93;
    ave=(m+e+c)/3;
    printf("math = %d, eng = %d, comp = %d, average = %d",m,e,c,ave);
    return 0; 
}

7-12 日期格式化 (5 分)

#include
int main()
{
    int mm,dd,yyyy;
    scanf("%d-%d-%d",&mm,&dd,&yyyy);
    printf("%04d-%02d-%02d",yyyy,mm,dd);
    return 0;
}

7-13 后天 (5 分)

#include 

int main() {
	int D;
	scanf("%d", &D);
	if (D <= 5)
		printf("%d", D + 2);
	else
		printf("%d", D-5);
	return 0;
}

7-14 然后是几点 (15 分)

#include
int main()
{
    int begin,later,pass,total,end;
    scanf("%d%d",&begin,&pass);
    total=begin/100*60+begin%100;
    end=total+pass;
    later=end/60*100+end%60;
    if (end/60==0)
    printf("%03d",later);
    else
    printf("%d",later);    
    return 0;
    
}

7-15 BCD解密 (10 分)

#include;
int main()
{
    int N,M;
    scanf("%d",&N);
    M=N/16*10+N%16;
    printf("%d",M);
    return 0;
}

7-16 计算符号函数的值 (10 分)

#include 

int main() {
	int N;
	scanf("%d", &N);
	if (N < 0) {
		printf("sign(%d) = -1", N);
	}
	if (N == 0) {
		printf("sign(%d) = 0", N);
	}
	if (N > 0) {
		printf("sign(%d) = 1", N);
	}
	return 0;
}

7-17 成绩转换 (15 分)

#include 

int main() {
	int grade;
	scanf("%d", &grade);
	if (grade >= 90)
		printf("A");
	if (80 <= grade && grade < 90)
		printf("B");
	if (70 <= grade && grade < 80)
		printf("C");
	if (60 <= grade && grade < 70)
		printf("D");
	if (grade < 60)
		printf("E");
	return 0;
}

7-18 出租车计价 (15 分)

#include
#include 

int main() {
	float km, fare1, total;
	int minute, pay,fare2;
	scanf ("%f %d", &km, &minute);

	if (km < 3)
		fare1 = 10;
	if (km > 3 && km <= 10)
		fare1 = 10 + 2 * (km - 3);
	if (km > 10)
		fare1 = 24 + 3 * (km - 10);
	fare2 = minute / 5 * 2;
	total = fare1 + fare2;
	pay = round(total);
	printf("%d", pay);
	return 0;


}

7-19 计算天数 (15 分)

#include 

int main() {
	int yyyy = 0, mm = 0, dd = 0, days = 0, i = 0;
	scanf("%d/%d/%d", &yyyy, &mm, &dd);
	int a[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	int b[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	if ((yyyy % 4 == 0 && yyyy % 100 != 0 || yyyy % 400 == 0)) {
		for (i = 0; i < mm - 1; i++) {
			days += b[i];
		}
	} else
		for (i = 0; i < mm - 1; i++) {
			days += a[i];
		}
	days = days + dd;
	printf("%d", days);
	return 0;

}

7-20 简单计算器 (20 分)

#include 

int main () {
	int a, b, sum = 0 ;
	char c;
	scanf("%d", &a);
	c = getchar();
	while (c != '=') {
		scanf("%d", &b);
		if (c == '/' && b == 0) {
			printf("ERRORn");
			return 0;
		}
		switch (c) {
			case '+':
				sum = a + b;
				break;
			case '-':
				sum = a - b;
				break;
			case '*':
				sum = a * b;
				break;
			case '/':
				sum = a / b;
				break;
			default:
				printf("ERRORn");

				return 0;
		}
		c = getchar();
		a = sum;
	}
	printf("%dn", a);
	return 0;
}