Find two C programs, why can a C program have at least 2 functions?

*Find 2+4+6+8+....+100 and *

#include ""

void main()

int n=100,i,s=0;Define integers n,i,s

for(i=2;i<=100;i+=2) assigns an initial value = 2 to i, and when i<=100, whenever the following operations are completed, i=i+2 until i is greater than 100.

s=s+i;Assign the value of s+i to s

printf("2+4+6+8+…The sum of +100 is: %d",s);Outputs

#include ""

void main()

int n,i,sum=0;

printf("Please enter an integer:");

scanf("%d",&n);

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

sum+=1*i*(i+1)/2;Put 2 into the final guarantee calculation, always an integer, which probably means this, add up the sum corresponding to each n.

printf("To 1+2+...d and the result is: %d",n,sum);

Hope it works for you.

The formula is there...

The first. int a=0;int i;

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

a=a+i;

Second, isn't there a formula...

int sum,n;

scanf("%d",&n);

sum=n*(n+1)/2;

Write it down yourself, it takes practice.

It's very simple, the first one is for(i=2; i<=100;i=i+2)sum+=i;

The second one is incomprehensible with the formula sum=1 2*n*(n+1) to 1+2+.What does it mean to make a sum?

If you want to know how to do it, just contact me!

Use the C language to write a programming idea and method for finding the sum of two numbers

1.First of all, you need to define three variables a, b, and c, two of which are the added numbers, and the third is the sum of the source checks obtained by the addition.

2.The two numbers entered from the keyboard are then received using the scanf() statement, assigning values to the variables a,b.

3.Next, the addition of a and b is performed to assign the result to the variable c.

4.Finally, use the printf() statement to display the result on the screen.

5.**After the writing is completed, click Run to see the running result of the program in the debugging window.

To be precise: a C program must have at least one function, which is the main() function.

C programs are made up of parallel functions.

The execution of a C program starts with the population function, i.e. the main function main() and ends at the end of main().

A C program is only allowed to have one function named main(). You can call other functions without being called by other functions. Therefore, the execution of a C program always starts with the main function, returns to the main function after completing the call to other functions, and finally ends the entire program with the main function.

A C source program must have, and can only have, one main function, main.

In C, because all function definitions, including the main function, are parallel. Therefore, within the body of a function, another function cannot be defined, i.e., it cannot be nested. However, functions are allowed to call each other, as well as nested calls.

It is customary to refer to the caller as the main tone function and the callee as the tone function. Functions can also call themselves on their own, known as recursive calls.

The main function is mandatory, and you can also customize the function.

1. Enter a string of characters from the keyboard and count the number of words entered. Words are separated by spaces.

Note: Only a simple space judgment is made, and no letter judgment is made, so non-letters will be considered as long as they are separated by spaces.

#include

int main()

p++;cout<<"The entered string is:"<

int main()

elsereturn 0;}

1, char str[100];

int i,j=1;

scanf("%c",str);

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

printf("Number of words = %d",j);

2,int a,b;

scanf("%d %d",&a,&b);

if(a==b)

printf("The two values are equal to %d",a);