addfile

C Practice/#test.c#

@@ -0,0 +1,6 @@
+#include <stdio.h>
+int main()
+{
+  printf("hello world.");
+  return 0;
+}

C Practice/#tony.c#

@@ -0,0 +1,2 @@
+#include <stdio.h>
+int main( string[  ] )

C Practice/1-34.c

@@ -15,4 +15,4 @@ int main(void)
 {
     three_hellos();
     return 0;
-}
+}

C Practice/1-35.c

@@ -1,11 +1,38 @@
+/*************************************************************************
+ > File Name: 1-35.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Wed Sep 14 23:12:33 2016
+ ************************************************************************/
+
 #include <stdio.h>
 
-int main(int argc, char *argv[]) {
-	int len=0;
-	char *p=s;
-	while(*p!=0)
-	{
-		len++;
-		p++;
-	}
-}
+void reverse(char *s)
+{
+    int len = 0;
+    char *p = s;
+    while(*p != 0)
+    {
+        len++;
+        p++;
+    }
+
+    int i = 0;
+    char c;
+    while(i <= len/2 -1)
+    {
+        c=*(s+i);
+        *(s+i)=*(s+len-1-i);
+        *(s+len-1-i)=c;
+        i++;
+    }
+}
+
+int main()
+{
+    char s[]="www.runoob.com";
+    printf("'%s' =>\n",s);
+    reverse (s);
+    printf("'%s'\n",s);
+    return 0;
+}

C Practice/1-36.c

@@ -0,0 +1,29 @@
+/*************************************************************************
+  > File Name: 1-36.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Wed Sep 14 23:20:43 2016
+ ************************************************************************/
+
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int i, j, k, n;
+    for(i=2; i<=100; i++)
+    {
+        k=(int)sqrt(i);
+        for(j=2; j<=k; j++)
+            if(i%j==0)
+                break;
+        if(j>k)
+        {
+            printf("%-d ",i);
+            n++;
+            if(n%5==0)
+                printf("\n");
+        }
+    }
+    return 0;
+}

C Practice/1-37.c

@@ -0,0 +1,35 @@
+/*************************************************************************
+ > File Name: 1-37.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Wed Sep 14 23:25:54 2016
+ ************************************************************************/
+
+#include <stdio.h>
+#define N 10
+
+int main()
+{
+    int i, j, a[N], temp;
+    printf("Please input 10 integers: \n");
+    for(i=0; i<N; i++)
+        scanf("%d",&a[i]);
+    for(i=0; i<N-1; i++)
+    {
+        int min = i;
+        for(j=i+1; j<N; j++)
+            if(a[min]>a[j])
+                min=j;
+        if(min!=i)
+        {
+            temp=a[min];
+            a[min]=a[i];
+            a[i]=temp;
+        }
+    }
+    printf("The sorted lsit is :\n");
+    for(i=0; i<N; i++)
+        printf("%d ",a[i]);
+    printf("\n");
+    return 0;
+}

C Practice/1-38.c

@@ -0,0 +1,22 @@
+/*************************************************************************
+ > File Name: 1-38.c
+ > Author: Tony
+ > Mail: shouqitao@163.com
+ > Created Time: Wed Sep 14 23:34:57 2016
+ ************************************************************************/
+
+#include <stdio.h>
+#define N 3
+
+int main()
+{
+    int i, j, a[N][N], sum=0;
+    printf("Please intput the matrix(3*3)\n");
+    for(i=0; i<N; i++)
+        for(j=0; j<N; j++)
+            scanf("%d",&a[i][j]);
+    for(i=0;i<N;i++)
+        sum+=a[i][i];
+    printf("the corner line sum is :%d\n",sum);
+    return 0;
+}

C Practice/1-39.c

@@ -0,0 +1,45 @@
+/*************************************************************************
+  > File Name: 1-39.c
+  > Author: Tony
+  > Mail: shouqitao@163.com
+  > Created Time: Wed Sep 14 23:43:35 2016
+ ************************************************************************/
+
+#include <stdio.h>
+
+int main()
+{
+    int a[11] = {1, 4, 6, 9, 13, 16, 19, 28, 40, 100};
+    int temp1, temp2, number, end, i, j;
+    printf("the old array is \n");
+    for(i = 0; i < 10; i++)
+        printf("%4d", a[i]);
+    printf("\nthe new array is ");
+    scanf("%d", &number);
+    end = a[9];
+    if(number > end)
+        a[10] = number;
+    else
+    {
+        for(i = 0; i < 10; i++)
+        {
+            if(a[i] > number)
+            {
+                temp1 = a[i];
+                a[i] = number;
+
+                for(j = i = 1; j < 11; j++)
+                {
+                    temp2 = a[j];
+                    a[j] = temp1;
+                    temp1 = temp2;
+                }
+                break;
+            }
+        }
+    }
+    for(i = 0; i < 11; i++)
+        printf("%4d", a[i]);
+    printf("\n");
+    return 0;
+}

C Practice/1-40.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#define N 10
+
+int main()
+{
+	int a[N]={0,1,2,3,4,5,6,7,8,9};
+	int i,t;
+	printf("the old array is :\n");
+	for(i=0;i<N;i++)
+		printf("%d ",a[i]);
+	for(i=0;i<N/2;i++)
+	{
+		t=a[i];
+		a[i]=a[N-1-i];
+		a[N-1-i]=t;
+	}
+
+	printf("\nthe new array is :\n");
+	for(i=0;i<N;i++)
+		printf("%d ",a[i]);
+	printf("\n");
+	return 0;
+}

C Practice/1-41.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+int main()
+{
+    void fun();
+    for(int i = 0; i < 3; i++)
+        fun();
+    return 0;
+}
+
+void fun()
+{
+    int i = 0;
+    static int static_i = 0;
+    printf("i=%d\n", i);
+    printf("static_i=%d\n", static_i);
+    i++;
+	static_i++;
+}

C Practice/1-42.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+int main()
+{
+    int i, num;
+    num = 2;
+    for(i = 0; i < 3; i++)
+    {
+        printf("num 变量为 %d \n", num);
+        num++;
+        {
+            auto int num = 1;
+            printf("内置模块 num 变量为 %d \n", num);
+            num++;
+        }
+    }
+    return 0;
+}

C Practice/1-43.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main()
+{
+	int i, num;
+	num=2;
+	for(i=0;i<3;i++)
+	{
+		printf("the num is: %d\n",num);
+		num++;
+		{
+			static int num=1;
+			printf("the inner num is: %d\n",num);
+			num++;
+		}
+	}
+	return 0;
+}

C Practice/1-44.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int a,b,c;
+void add()
+{
+	int a;
+	a=3;
+	c=a+b;
+}
+
+int main()
+{
+	a=b=4;
+	add();
+	printf("C's value is: %d\n",c);
+	return 0;
+}

C Practice/1-45.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main()
+{
+	register int i;
+	int tmp=0;
+	for(i=0;i<=100;i++)
+		tmp+=i;
+	printf("Sum is %d\n", tmp);
+	return 0;
+}

C Practice/1-46.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#define TRUE 1
+#define FALSE 0
+#define SQ(x) (x)*(x)
+
+int main()
+{
+    int num;
+    int again = 1;
+    printf("if num less than 50 the program will stop. \n");
+    while (again)
+    {
+        printf("\nPlease input a number: ");
+        scanf("%d", &num);
+        printf("the value of num*num is %d \n", SQ(num));
+        if (num >= 50)
+            again = TRUE;
+        else
+            again = FALSE;
+    }
+    return 0;
+}

C Practice/1-47.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#define exchange(a,b){int t;t=a;a=b;b=t;}
+
+int main()
+{
+    int x = 10;
+    int y = 20;
+    printf("x=%d; y=%d\n", x, y);
+    exchange(x, y);
+    printf("x=%d; y=%d\n", x, y);
+    return 0;
+}

C Practice/1-48.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#define SMA <
+#define LAG >
+#define EQ ==
+
+int main()
+{
+    int i, j;
+    printf("Please input two integers: \n");
+    scanf("%d %d", &i, &j);
+    if(i LAG j)
+        printf("%d is greater then %d \n", i, j);
+    else if(i EQ j)
+        printf("%d is equal %d \n", i, j);
+    else if( i SMA j)
+        printf("%d is less the %d \n", i, j);
+    return 0;
+}