C language must read a few examples, understand after benefit

1. Find the sum of the first 5 items of SN=A+AA+AAA+AAAA+AAAAA, where a is a number, for example: 2+22+222+2222+22222

#include <stdio.h>

#include <stdlib.h>

int main ()

{

int i = 0;

intj = 0;

int a = 0;

int sum = 0;

printf ("Please enter a number (single digit):");

scanf_s ("%d", &i);

A = i;

for (j = 1; j < 6; J + +)

{

sum + = i;

i = i * ten + A;

}

printf ("%d", sum);

System ("pause");

return 0;

}

2.

Write a program that reads the C source code from the standard input (terminal) and verifies that all curly braces are correctly paired.

For example:

Enter: {} {}, match successfully.

Input: {}{{}}, successful match

Input: {}}{, match unsuccessful

Input:}}{{, match unsuccessful

Input: {}}, match unsuccessful

Input:}{}{{, match unsuccessful

#include <stdio.h>

#include <stdlib.h>

int main ()

{

int cou = 0;

Char ch;

while ((ch = getchar ())! = ' \ n ')

{

if (ch = = ' {')

cou++;

else if (ch = = '} ')

{

if (cou = = 0)

printf ("Match not successful!");

cou--;

}

}

if (cou = = 0)

printf ("Match success! ");

Else

printf ("The match is unsuccessful!") ");

System ("pause");

return 0;

3. Write the binary lookup function.

#include <stdio.h>

#include <stdlib.h>

int main ()

{

int a[11] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

intmin = 0, max = ten, Mid, N;

printf ("Please enter the number you are looking for: \ n");

scanf_s ("%d", &n);

while (min + 1! = max)

{

Mid = (min + max)/2;

if (N>a[mid]) min = mid;

else if (N<a[mid]) max = mid;

Else

{

printf ("Number of inputs in%d bits of the series \ n", mid); Break

}

}

if (n = = A[max]) printf ("Number of inputs in%d bits of the sequence \ n", max);

else if (n = = A[min]) printf ("Number of inputs in%d bits of the sequence \ n", min);

else if (n! = A[mid]) printf ("Number of inputs not in the sequence");

System ("pause");

return 0;

}

4. Write a program that reads several lines of input from the standard input. Each line of input is printed to the standard output, preceded by a line number.

There is no limit to the length of the input lines that the program can handle when writing this program.

#include <stdio.h>

#include <stdlib.h>

int main ()

{

int n = 1, at_beginning = 1;

Char ch;

while (1)

{

printf ("Please input the line:\n");

Do

{

scanf_s ("%c", &ch);

if (at_beginning = = 1)

{

at_beginning = 0;

printf ("%d", n);

}

printf ("%c", ch);

} while (ch! = ' \ n ');

at_beginning = 1;

n++;

}

System ("pause");

return 0;

}

5. Compile such a program, the user input 10 integers, the program to find the maximum and minimum value

#include <stdio.h>

#include <stdlib.h>

int main ()

{

int a[10], I, Max, Min;

for (i = 0; i<10; i++)

{

printf ("num%d=", i + 1);

scanf_s ("%d", &a[i]);

}

max = a[0]; min = a[0];

for (i = 0; i<10; i++)

{

if (a[i]>max) max = A[i];

if (a[i]<min) min = a[i];

}

printf ("max=%d\n", Max);

printf ("min=%d\n", min);

System ("pause");

return 0;

}

6. Write the program solution:

There are 1, 2, 3, 4 digits, how many different and no repetition of the number of three digits? Print it out?

#include <stdio.h>

#include <stdio.h>

Main ()

{

int I, j, K;

int m = 0;

for (i = 1; i<5; i++)

for (j = 1; j<5; j + +)

for (k = 1; k<5; k++)

{

if (i! = j&&k! = j&&i! = k)

{

printf ("%d%d%d\n", I, J, K);

m++;

}

}

printf ("A total number of:");

printf ("%d\n", m);

System ("pause");

return 0;

}

This article is from "Sherry Wang" blog, please be sure to keep this source http://940814wang.blog.51cto.com/10910665/1722621

C language must read a few examples, understand after benefit