C language 1 100 even number sum program

#include

main()

int i,sum;

for(i=2;i<=100;i+=2)

sum+=i;

printf("The even sum between 1 and 100 is: %3d"sum);

Upstairs is wrong, because the first loop, if your i is set to one, it will still be added.

Upstairs ignores the order of the loops.

In the for loop, it is initialized first, then the condition is determined, then the loop body is calculated, and finally the value of i is changed, which is i=i+2

Then the condition is judged, then the change is made, and then the value of i is changed.

C finds the sum of 1 to 100 even numbers and is programmed as follows:

#include

main()

int i,sum=0;

for(i=0;i<=100;i=i+2)

sum=sum+i;

printf("%d",sum);

C language-specific features:

C language is the most universal computer programming language, which can not only play the function of high-level programming language, but also has the advantages of assembly language, so compared with other programming languages, it has its own unique characteristics. Specifically, it is embodied in the following three aspects:

First, extensiveness. The size of the arithmetic range of the C language directly determines its advantages and disadvantages. There are 34 operators in C, so the range of operations is wider than in many other languages, and the results can be expressed in a wide variety of ways.

In addition, the C language contains a variety of data structure forms such as character type and pointer type, so it can also handle larger data structure operations.

Second, brevity. 9 types of control statements and 32 keywords are the basic characteristics of C language, which makes it have a wide range of applicability in computer application writing, which can not only be applied to the operation of the majority of programmers, improve their work efficiency, but also support advanced programming, avoiding the cumbersome language switching.

Third, the structure is perfect. C is a structured language that can implement modular applications in the form of modular units, which has significant advantages in system description, and at the same time, it can adapt to a variety of different programming requirements and perform efficiently.

C language how to shoot the sample to find 1 to 100 even staring at the sum of the stupid number of spikes.

#include

int main(void) {

int i,sum=0;

for(i=2;i<=100;i =2){sum =i;Once per cycle, add the current even number to the sum printf("The sum of all even numbers between 1 and 100 is: %d",sum);

return 0;Returning an integer of 0 indicates a normal exit.

#include

int main()

int n,s=0;

for(n = 1; n <= 100;n ++ iterates through all values.

if(n%2==0) is even.

s+=n;Accumulate.

printf("%d",s);Output the result.

return 0;

About the even number nature:(1) Two consecutive integers must be an odd number and an even number;

2) the sum or difference between odd and odd numbers is even; The sum or difference between an even and an odd number is an odd number; The sum of any number of even numbers is even; The sum of singular odd numbers is odd; The sum of even odd numbers is even;

3) The sum or difference of two odd (even) numbers is even; The sum or difference of an even number and an odd number must be an odd number;

4) All positive and even numbers except 2 are composite;

1. Iterate through all numbers within 100 and judge that if it is an even number, it will be accumulated.

#include

int main()

2. Directly traverse even numbers and add them up.

#include

int main()

3. Use equal difference series and value formulas. 12

#include

int main()

4. Contrast. In terms of efficiency, the third method avoids the loop, so it is the most efficient.

``c#include

int main()

int sum = 0;Define a variable to hold the sum of even numbers.

for (int i = 2; i <= 100;i = 2) { Start the cycle from 2 and add 2 each time until 100 ends the cycle. }

sum = i;Add the current number to sum.

printf("The sum of all even numbers between 1 100 is %d", sum);Outputs the final sum.

return 0;

1. Open the empty project in Visual Stdio 2019, right-click the source file on the left, click New, Add, and New Item in order, and the window of the new file will pop up

2. Create a new C++ file and change the file extension to. c, click add to create a new file, and then you can write **:

3. The odd number here is an integer with a remainder after dividing by 2, so the program is simpler, and the number within 100 is judged to be odd in the for loop, if so, it will be added, and the final output result will be on the line:

4. Press the shortcut key CRTL+F5 to run the program, and you can get the calculation result. The above is a demo program that uses a C program to find the sum of all odd numbers between 1 and 100