(C syntax) Calculate the sum of 1 + 2 + 3 + 4... + n, 4...

(C syntax) Calculate the sum of 1 + 2 + 3 + 4... + n, 4...

Knowledge point:

For (;) loop usage

S + = I

 

Content: calculates the sum of 1 + 2 + 3 + 4... + n

Input description:

An integer n

Output description:

And

 

Input example:

100

Output example:

5050

 

#include <stdio.h>int main(){ int n,i,sum=0; scanf("%d",&n); for (i=0;i<=n;i++) {  sum+=i; } printf("%d\n",sum); return 0;}

 

C language programming: Calculate the sum of all numbers in a positive integer N. For example, if you enter 1234, the value of 1 + 2 + 3 + 4 is calculated.

# Include <iostream. h>
# Include <math. h>
Void main ()
{
Int a, t, m, sum = 0;
Cout <"enter a positive number :";
Cin>;
For (int I = 0; I <= 10; I ++)
{
M = pow (10, I );
T = a/m % 10;
Sum = sum + t;
}

Cout <sum <endl;
}

1st math question! A = 19, B =-4, C =-21, which is the value of-a-B-c? Calculate 1 + (-2) + 3 + (

-19-4-(-21) =-23 + 21 =-2
1 + 2-3 + 4-5 + 6-7 + 8-9.......-97 + 98-99 + 100 = 1 + (2-3) + (4-5) + (6-7) + (8-9 )..... (96-97) + (98-99) + 100 = 1-1-1-1-1.....-1-1 + 100 = 101-49 = 52 (49 is a division of 1,100, 98 are left, two in one group, 98/2 = 49 groups in total)
Ordinary paper cannot be folded for 10 times in a row. It can be up to eight or nine times. If it reaches 10 times, the thickness should be 204.8mm.
Split X times, X power of 2 = 16, X = 4, split 4 times, one and a half hours, total 2 hours
2 pieces of dough (1 time) 2x2 = 4 (2 times) 4x2 = 8 (3 times) 8x2 = 16 (4 times) 16*2 = 32 (5 times) 32*2 = 64 (6 times) 64*2 = 128 (7 times) 128*2 = 256 (8 times) 256*2 = 512 (9 times) 512*2 = 1024 (10 times)