Take you to brush (niuke.com) C language hundred questions (the first day)

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Catalog

Exercises 1 ：Hello Nowcoder!

Exercise 2 ： Print small aircraft

Exercise 3 ： Niuniu talks -- Integers

Exercise 4 ： Niuniu talks -- Floating point numbers

Exercise five ： Niuniu talks -- character

Exercise 6 ： The second integer of Niuniu  

Conclusion

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Preface

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Exercises 1 ：Hello Nowcoder!

describe

Output "Hello Nowcoder!". Start your programming journey .

Examination site ： The main test is to master basic grammar

Specific code ：

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

Exercise 2 ： Print small aircraft

describe

KiKi Learned to printf Output information on the screen , He wants to export a small plane . Please write a program for him to output this small plane .

Output description ：

  analysis ： about printf Use and understanding of library functions , Note that you should remember to wrap every time you print (\n)

Specific code ：

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

Exercise 3 ： Niuniu talks -- Integers

describe

Niuniu has just been born , cry piteously for food , At first he could only say simple numbers , You tell him an integer , He can learn at once .

Enter an integer , Output this integer .

Input description ：

Enter an integer , The scope is 32 Bit signed integer range

Output description ：

Output this integer , for example ：

Input ：3

Output ：3

analysis ： The main test is scanf The use of library functions , Note that the integer is %d, Don't forget to take the address of the variable (&)

Specific code ：

#include <stdio.h>
int main()
{
    int n = 0;
    // Input integer n
    scanf("%d",&n);
    // Print integers n
    printf("%d\n",n);
    return 0;
}

Exercise 4 ： Niuniu talks -- Floating point numbers

describe

Can say integer after , Niuniu began to try floating point numbers （ decimal ）

Enter a floating point number , Output this floating point number .

Input description ：

Enter a floating point number

Output description ：

Output a floating point number , Keep three decimal places ; for example ：

Input ：1.359578

Output ：1.360

analysis ： For floating point number output and printing is %f, To keep n Decimal place , Need to be in %f Add milk in the middle .n, for example ：%.nf

Specific code ：

#include <stdio.h>
int main()
{
    float a=0.0;
    scanf("%f",&a);
    printf("%.3f",a);
    return 0;
}

Exercise five ： Niuniu talks -- character

describe

After floating point numbers , Niuniu began to try characters

Enter a character , Output this character .

Input description ：

Enter a character , The scope is ASCII Within the scope of

Output description ：

Output this character

Input ：a

Output ：a

analysis ： For character type output and printing is %c, You can also use getchar() Library function

Specific code ：

#include <stdio.h>
int main()
{
    //---------- Method 1：
    char ch = 0;
    scanf("%c",&ch);
    printf("%c\n",ch);
    
    //---------- Method 2： Use getchar() To get a character , Can return int You can also return char
    int i = getchar();// Each character corresponds to ASCII Code value , therefore int Type reception is no problem 
    putchar(i); 
    
    return 0;
}

Exercise 6 ： The second integer of Niuniu  

describe

Niu Niu inputs three integers from the keyboard , And try to display the second integer on the screen .

Input description ：

One line input 3 It's an integer , Space off .

Output description ：

Please output the value of the second integer .

Input ：1 2 3

Output ：2

analysis ： Print out the middle number , We can define an array to store these three numbers , Access with subscript ; You can also define three variables to store and print

Specific code ：

#include <stdio.h>
int main()
{
    //----------------- Method 1. Using arrays 
    int arr[3]={0};
    int i=0;
    // Input 3 Data 
    for(i=0;i<3;i++)
    {
        scanf("%d",&arr[i]);
    }
    // Print by subscript 
    printf("%d\n",arr[1]);
    
    //----------------- Method 2. Definition 3 A variable 
    int x,y,z;
    scanf("%d%d%d",&x,&y,&z);
    // Take out the middle data directly through variables 
    printf("%d",y);
    return 0;
}

Conclusion

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