update

C Practice/1-1.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, k;
+    printf("\n");
+    for(i=1; i<5; i++){
+        for(j=1; j<5; j++){
+            for(k=1; k<5; k++){
+                if(i != j && i !=j && j != k)
+                    printf("%d %d %d\n",i,j,k);
+            }
+        }
+    }
+    return 0;
+}

C Practice/1-10.c

@@ -0,0 +1,21 @@
+/*************************************************************************
+  > File Name: 1-10.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Sat Sep 10 12:07:46 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int i, j;
+    printf("\1\1\n");
+    for(i=1; i<11; i++){
+        for(j=1; j<=i; j++)
+            printf("%c%c",219,219);
+        printf("\n");
+    }
+
+    return 0;
+}

C Practice/1-11.c

@@ -0,0 +1,22 @@
+/*************************************************************************
+  > File Name: 1-11.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Sat Sep 10 12:11:07 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int f1=1, f2=1, i;
+    for(i=1;i<=20;i++)
+    {
+        printf("%12d%12d",f1,f2);
+        if(i%2==0)
+            printf("\n");
+        f1=f1+f2;
+        f2=f1+f2;
+    }
+    return 0;
+}

C Practice/1-12.c

@@ -0,0 +1,33 @@
+/*************************************************************************
+  > File Name: 1-12.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Sat Sep 10 14:03:40 2016
+ ************************************************************************/
+#include <stdio.h>
+
+int main()
+{
+    int i,j;
+    int count=0;
+
+    for (i=101; i<=200; i++)
+    {
+        for (j=2; j<i; j++)
+        {
+            /* 如果j能被i整出在跳出循环 */
+            if (i%j==0)
+                break;
+        }
+        /* 判断循环是否提前跳出，如果j<i说明在2~j之间,i有可整出的数 */
+        if (j>=i)
+        {
+            count++;
+            printf("%d ",i);
+            /* 换行，用count计数，每五个数换行 */
+            if (count % 5 == 0)
+                printf("\n");
+        }
+    }
+    return 0;
+}

C Practice/1-13.c

@@ -0,0 +1,24 @@
+/*************************************************************************
+ > File Name: 1-13.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 10:02:50 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int i, x, y, z;
+    for(i = 100; i < 1000; i++)
+    {
+        x = i % 10;
+        y = i / 10 % 10;
+        z = i / 100 % 10;
+
+        if(i == (x * x * x + y * y * y + z * z * z))
+            printf("%d\n", i);
+
+    }
+    return 0;
+}

C Practice/1-14.c

@@ -0,0 +1,29 @@
+/*************************************************************************
+ > File Name: 1-14.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 10:10:16 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int n, i;
+    printf("Please input a integer:\n");
+    scanf("%d",&n);
+    printf("%d=",n);
+    for(i=2; i <= n; i++)
+    {
+        while(n%i==0)
+        {
+            printf("%d",i);
+            n/=i;
+            if(n!=1)
+                printf("*");
+        }
+    }
+
+    printf("\n");
+    return 0;
+}

C Practice/1-15.c

@@ -0,0 +1,19 @@
+/*************************************************************************
+ > File Name: 1-15.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 10:39:23 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int score;
+    char grade;
+    printf("Please input a integer: ");
+    scanf("%d",&score);
+    grade=(score>90)?'A':((score>=60)?'B':'C');
+    printf("%c\n",grade);
+    return 0;
+}

C Practice/1-16.c

@@ -0,0 +1,34 @@
+/*************************************************************************
+ > File Name: 1-16.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 10:43:32 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int a, b,t,r;
+    printf("Please input two integers: ");
+    scanf("%d %d",&a,&b);
+    if(a<b)
+    {
+        t=b;
+        b=a;
+        a=t;
+    }
+
+    r=a%b;
+
+    int n= a*b;
+    while (r!=0)
+    {
+        a=b;
+        b=r;
+        r=a%b;
+    }
+    printf("zhe liang ge shu de zui da gong yue shu shi %d, zuixiao gongbeishu shi%d",b,n/b);
+
+    return 0;
+}

C Practice/1-17.c

@@ -0,0 +1,28 @@
+/*************************************************************************
+ > File Name: 1-17.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 11:24:55 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    char c;
+    int letters=0,space=0,digits=0,others=0;
+    printf("Please input some charactors: \n");
+    while((c=getchar())!='\n')
+    {
+        if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
+            letters++;
+        else if(c>='0'&&c<='9')
+            digits++;
+        else if(c==' ')
+            space++;
+        else
+            others++;
+    }
+    printf("charactors=%d,digits=%d,space=%d,others=%d",letters,digits,space,others);
+    return 0;
+}

C Practice/1-18.c

@@ -0,0 +1,25 @@
+/*************************************************************************
+ > File Name: 1-18.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 11:36:42 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    int s=0,a,n,t;
+    printf("Pleas input 'a' and 'n': \n");
+    scanf("a=%d, n=%d",&a,&n);
+    t=a;
+    while(n>0)
+    {
+        s+=t;
+        a=a*10;
+        t+=a;
+        n--;
+    }
+    printf("a+aa+...=%d\n",s);
+    return 0;
+}

C Practice/1-19.c

@@ -0,0 +1,36 @@
+/*************************************************************************
+  > File Name: 1-19.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Sun Sep 11 11:58:59 2016
+ ************************************************************************/
+
+#include<stdio.h>
+#define N 1000
+int main()
+{
+    int i, j, k, n, sum;
+    int a[256];
+    for(i = 2; i <= N; i++)
+    {
+        sum = a[0] = 1;
+        k = 0;
+        for(j = 2; j <= (i / 2); j++)
+        {
+            if(i % j == 0)
+            {
+                sum += j;
+                a[++k] = j;
+            }
+        }
+        if(i == sum)
+        {
+            printf("%d=%d", i, a[0]);
+            for(n = 1; n <= k; n++)
+                printf("+%d", a[n]);
+            printf("\n");
+        }
+
+    }
+    return 0;
+}

C Practice/1-2.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+int main()
+{
+    long int i;
+    int bonus1, bonus2, bonus4, bonus6, bonus10, bonus;
+    scanf("%ld",&i);
+    bonus1 = 100000 * 0.1;
+    bonus2 = bonus1 + 100000 * 0.75;
+    bonus4 = bonus2 + 200000 * 0.5;
+    bonus6 = bonus4 + 200000 * 0.3;
+    bonus10 = bonus6 + 400000 * 0.15;
+
+    if(i<100000)
+        bonus=i*0.1;
+    else if(i<=200000)
+        bonus=bonus1+(i-100000)*0.075;
+    else if(i<=400000)
+        bonus=bonus2+(i-200000)*0.05;
+    else if(i<=600000)
+        bonus=bonus4+(i-400000)*0.03;
+    else if(i<1000000)
+        bonus=bonus6+(i-600000)*0.015;
+    else
+        bonus=bonus10+(i-1000000)*0.01;
+    printf("bonus=%d",bonus);
+    printf("\n");
+}

C Practice/1-20.c

@@ -0,0 +1,23 @@
+/*************************************************************************
+ > File Name: 1-20.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Sun Sep 11 12:17:08 2016
+ ************************************************************************/
+
+#include<stdio.h>
+
+int main()
+{
+    float h,s;
+    s=h=100;
+    h=h/2;
+    for(int i=2;i<=10;i++)
+    {
+        s=s+2*h;
+        h=h/2;
+    }
+
+    printf("the distance of 10th hit the ground is %f m,and the the high is %f m.\n",s,h);
+    return 0;
+}

C Practice/1-21.c

@@ -0,0 +1,25 @@
+/*************************************************************************
+  > File Name: 1-21.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Sun Sep 11 12:55:04 2016
+ ************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int day, x1=0, x2;
+    day = 9;
+    x2=1;
+    while(day>0)
+    {
+        x1=(x2+1)*2;
+        x2=x1;
+        day--;
+    }
+
+    printf("Sum is %d\n",x1);
+    return 0;
+}