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第一次作业题解
P5717 【深基3.习8】三角形分类
思路
考的是if()的使用,还要给三条边判断大小
判断优先级：
- 三角形？
- 直角、钝角、锐角
- 等腰
- 等边
判断按题给顺序来
代码
#include <stdio.h>
int main()
{int a = 0, b = 0, c = 0, x = 0, y = 0, z = 0;scanf("%d %d %d", &a, &b, &c);x = (a < b ? a : b) < c ? (a < b ? a : b) : c; z = (a > b ? a : b) > c ? (a > b ? a : b) : c;y = a + b + c - x - z;if (x + y <= z) {printf("Not triangle\n");}else {if (x * x + y * y == z * z) printf("Right triangle\n");else if (x * x + y * y > z * z) printf("Acute triangle\n");else if (x * x + y * y < z * z) printf("Obtuse triangle\n");if(x == y || y == z || x == z) printf("Isosceles triangle\n");if(x == y && y == z) printf("Equilateral triangle\n");}return 0;
}
P5714 【深基3.例7】肥胖问题
思路
数据类型用double
先计算，后判断，超重要多输出个BMI
看着麻烦，刚开始把我也唬住了
其实用%g就好了，涨知识了（参考群里《C Primer Plus》表4.3）
代码
#include <stdio.h>
int main()
{double m = 0, h = 0, bmi = 0;scanf("%lf %lf", &m, &h);bmi = m / (h * h);if (bmi < 18.5) printf("Underweight\n");else if (bmi >= 24) printf("%.6g\nOverweight\n", bmi);else printf("Normal\n");return 0;
}
P1422 小玉家的电费
思路
对用电量判断，最后保留一位小数
代码
#include <stdio.h>
int main()
{double a = 0, ans = 0;scanf("%lf", &a);if (a <= 150) ans = a * 0.4463;else if (a >= 151 && a <= 400) ans = 150 * 0.4463 + (a - 150) * 0.4663;else ans = 150 * 0.4463 + 250 * 0.4663 + (a - 400) * 0.5663;printf("%.1lf", ans);return 0;
}
P4414 [COCI2006-2007#2] ABC
思路
先比大小，得出ABC
ABC、ACB、BAC、BCA、CAB、CBA六种情况，不用字符串也可以，就麻烦一点
代码
#include <stdio.h>
int main()
{int a = 0, b = 0, c = 0, A = 0, B = 0, C = 0;char x = 0, y = 0, z = 0;scanf("%d %d %d", &a, &b, &c);scanf("\n%c%c%c", &x, &y, &z);A = (a < b ? a : b) < c ? (a < b ? a : b) : c; C = (a > b ? a : b) > c ? (a > b ? a : b) : c;B = a + b + c - A - C;if (x == 'A' && y == 'B' && z =='C') printf("%d %d %d", A, B, C);else if (x == 'A' && y == 'C' && z =='B') printf("%d %d %d", A, C, B);else if (x == 'B' && y == 'A' && z =='C') printf("%d %d %d", B, A, C);else if (x == 'B' && y == 'C' && z =='A') printf("%d %d %d", B, C, A);else if (x == 'C' && y == 'B' && z =='A') printf("%d %d %d", C, B, A);else if (x == 'C' && y == 'A' && z =='B') printf("%d %d %d", C, A, B);return 0;
}
P1909 [NOIP2016 普及组] 买铅笔
思路
- 每种的情况要买几包
- 每种情况的价钱
- 找出最优解
代码
#include <stdio.h>
int main()
{int n = 0, n1 = 0, v1 = 0, n2 = 0, v2 = 0, n3 = 0, v3 = 0;int x = 0, y = 0, z = 0, ans = 0;scanf("%d %d %d %d %d %d %d", &n, &n1, &v1, &n2, &v2, &n3, &v3);if (n % n1 == 0) x = (n / n1) * v1;else x = (n / n1 + 1) * v1; if (n % n2 == 0) y = (n / n2) * v2;else y = (n / n2 + 1) * v2; if (n % n3 == 0) z = (n / n3) * v3;else z = (n / n3 + 1) * v3; ans = (x < y ? x : y) < z ? (x < y ? x : y) : z;printf("%d", ans);return 0;
}
写在后面
洛谷题确实有点难度，不过再难也是基础题。加油吧，少年！
也可以试试C语言网的题集，更基础一点
晚安