Initial commit.

操作系统原理/README.md

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+一定要去听 JJM 的复习课！

程序设计基础/README.md

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+如果有兴趣，可以移步我的博客，查看我的 C 语言易错点清单。
+
+http://blog.zhanghai.me/c-exam-notes/

程序设计基础/练习/代码/1/1.c

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+#include <stdio.h>
+
+int main(void)
+{
+	printf("Hello World!\n");
+	return 0;
+}

程序设计基础/练习/代码/1/2.c

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+#include <stdio.h>
+
+int main(void)
+{
+	printf("What is a computer?\n");
+	return 0;
+}

程序设计基础/练习/代码/1/3.c

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+#include <stdio.h>
+
+int main(void)
+{
+	printf("****\n");
+	printf("***\n");
+	printf("**\n");
+	printf("*\n");
+	return 0;
+}

程序设计基础/练习/代码/1/4.c

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+#include <stdio.h>
+
+int main(void)
+{
+	printf("Welcome to You!\n");
+	return 0;
+}

程序设计基础/练习/代码/1/5.c

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+#include <stdio.h>
+
+int main(void)
+{
+	printf("Programming in C is fun!\n");
+	return 0;
+}

程序设计基础/练习/代码/1/6.c

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+#include <stdio.h>
+
+int main(void)
+{
+	printf("* * * *\n");
+	printf(" * * *\n");
+	printf("  * *\n");
+	printf("   *\n");
+	return 0;
+}

程序设计基础/练习/代码/30001.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int celsius = 37, fahr = 100;
+    printf("fahr = %d, celsius = %d\n", fahr, celsius);
+    return 0;
+}

程序设计基础/练习/代码/30002.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int celsius = 66, fahr = 150;
+    printf("fahr = %d, celsius = %d\n", fahr, celsius);
+    return 0;
+}

程序设计基础/练习/代码/30003.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int celsius = 26, fahr = 78;
+    printf("celsius = %d, fahr = %d\n", celsius, fahr);
+    return 0;
+}

程序设计基础/练习/代码/30004.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int celsius, fahr;
+
+    fahr = GetInteger();
+    celsius = 5 * (fahr - 32) / 9;
+    printf("celsius = %d\n", celsius);
+    return 0;
+}

程序设计基础/练习/代码/30005.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int math = 87, eng = 72, comp = 93, average = 84;
+    printf("math = %d, eng = %d, comp = %d, average = %d\n", math, eng, comp, average);
+    return 0;
+}

程序设计基础/练习/代码/30006.c

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+#include <stdio.h>
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int a, b, c;
+    double average;
+
+    a = GetInteger();
+    b = GetInteger();
+    c = GetInteger();
+    average = (a + b + c) / 3.0;
+    printf("average = %.2f\n", average);
+    return 0;
+}

程序设计基础/练习/代码/30007.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int n = 152, digit1 = 2, digit2 = 5, digit3 = 1;
+    printf("整数%d的个位数字是%d, 十位数字是%d, 百位数字是%d\n", n, digit1, digit2, digit3);
+    return 0;
+}

程序设计基础/练习/代码/30008.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int x,y;
+    printf("9 = 3 * 3\n");
+    printf("3 * 3 = 9\n");
+    return 0;
+}

程序设计基础/练习/代码/30009.c

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+#include <stdio.h>
+#include <math.h>
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int money, year;
+    double interest, rate;
+
+    money = GetInteger();
+    year = GetInteger();
+    rate = GetReal();
+    interest = money * pow(1 + rate, year) - money;
+    printf("interest = %.2f\n", interest);
+    return 0;
+}

程序设计基础/练习/代码/30010.c

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+#include <stdio.h>
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int looptimes, ri;
+    double x, y;
+
+    looptimes = GetInteger();
+    for (ri = 1; ri <= looptimes; ++ri) {
+        x = GetReal();
+        y = x == 0 ? 0 : 1 / x;
+        printf("f(%.2f) = %.1f\n", x, y);
+     }
+    return 0;
+}

程序设计基础/练习/代码/30011.c

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+#include <stdio.h>
+#include <math.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int rep,ri;
+    double x, y;
+
+    rep = GetInteger();
+    for (ri = 1; ri <= rep; ++ri) {
+        scanf("%lf", &x);
+        y = x >= 0 ? sqrt(x) : (pow(x + 1, 2) + 2 * x + 1 / x);
+        printf("f(%.2f) = %.2f\n", x, y);
+    }
+    return 0;
+}

程序设计基础/练习/代码/30011_2.c

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+#include <stdio.h>
+#include <math.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int rep,ri;
+    double x, y;
+
+    rep = GetInteger();
+    for (ri = 1; ri <= rep; ++ri) {
+        x = GetReal();
+        y = x >= 0 ? sqrt(x) : (pow(x + 1, 2) + 2 * x + 1 / x);
+        printf("f(%.2f) = %.2f\n", x, y);
+    }
+    return 0;
+}

程序设计基础/练习/代码/30012.c

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+#include <stdio.h>
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int looptimes, ri;
+    double x, y;
+
+    looptimes = GetInteger();
+    for (ri = 1; ri <= looptimes; ++ri) {
+        x = GetReal();
+        y = x != 10 ? x : 1 / x;
+        printf("f(%.1f) = %.1f\n", x, y);
+    }
+    return 0;
+}

程序设计基础/练习/代码/30013.c

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+#include <stdio.h>
+#include <genlib.h>
+#include "simpio.h"
+
+int main(void)
+{
+    int looptimes, ri;
+    int x, y;
+
+    looptimes = GetInteger();
+    for (ri = 1; ri <= looptimes; ++ri) {
+        x = GetInteger();
+        y = x < 0 ? -1 : (x == 0 ? 0 : 1);
+        printf("sign(%d) = %d\n", x, y);
+    }
+    return 0;
+}

程序设计基础/练习/代码/30019.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int i = 0, sum = 5050;
+    printf("sum = %d\n", sum);
+    return 0;
+}

程序设计基础/练习/代码/30020.c

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+#include <stdio.h>
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int i, m, sum;
+    int looptimes, ri;
+
+    looptimes = GetInteger();
+    for (ri = 1; ri <= looptimes; ++ri) {
+        m = GetInteger();
+        sum = (m + 100) * (101 - m) / 2;
+        printf("sum = %d\n", sum);
+    }
+    return 0;
+}

程序设计基础/练习/代码/30027.c

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+#include <stdio.h>
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int choice, i;
+    double price;
+
+    for (i = 1; i <= 5; ++i) {
+        printf("[1] apples\n");
+        printf("[2] pears\n");
+        printf("[3] oranges\n");
+        printf("[4] grapes\n");
+        printf("[0] Exit\n");
+        choice=GetInteger();
+        if (choice == 0) {
+            break;
+        } else {
+                switch (choice)
+                {
+                case 1:
+                    price = 3.0;
+                    break;
+                case 2:
+                    price = 2.5;
+                    break;
+                case 3:
+                    price = 4.1;
+                    break;
+                case 4:
+                    price = 10.2;
+                    break;
+                default:
+				    price = 0;
+                }
+                printf("price = %0.1f\n", price);
+        }
+    }
+    return 0;
+}

程序设计基础/练习/代码/30034.c

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+#include <stdio.h>
+#include "genlib.h"
+
+int main(void)
+{
+    int i, sum = 816;
+    printf("%d", sum);
+    return 0;
+}

程序设计基础/练习/代码/30035.c

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+#include "stdio.h"
+#include "genlib.h"
+#include "simpio.h"
+
+int main(void)
+{
+    int i, j, n, o, p, q, r;
+    int looptimes, ri;
+
+    looptimes = GetInteger();
+    for (ri = 1; ri <= looptimes; ++ri) {
+        n = GetInteger();
+        /* Print lines */
+        o = 2 * n;
+        /* i is line number */
+        for (i = 1; i != o; ++i) {
+            /* Print leading spaces */
+            p = 2 * (n - i);
+            if (p < 0) { p = -p; }
+            for (j = 0; j != p; ++j) { printf(" "); }
+            /* Print asterisks and spaces between */
+            q = 2 * i - 1;
+            r = 2 * n - 1;
+            if (q > r) { q = 2 * r - q; } 
+            for (j = 0; j != q; ++j) {
+                if (j != 0) { printf(" "); }
+                printf("*");
+            }
+            /* Print new line */
+            printf("\n");
+        }
+    }
+    return 0;
+}