C explains the steps to solve the problem, and C solves the process

main() [main function main program].

int i,j,k;【Define integer data i,j,k】for(i=1; i<=6;i++) main loop, i from 1 to 6, increasing to 1] for(j=1; j<=20-2*i;j++) subcycle, j from 1 to 20-2*i

Increment to 1]printf(" ");[Output.]""】for(k=1;k<=i;k++) subcycle, K from 1 to i, incrementing to 1] printf("%4d", i );Output the value of i with the rule of %4d (four characters with the original data retained if exceeded).

printf(" ");

main（）

int i,j,k;

for(i=1;i<=6;i++) has a total of three layers of circulation, which is the outermost layer.

for(j=1;j<=20-2*i;j++) This is the second layer of the loop, when i; =1, j< 18, i=2; j<=16;i=3;j<=14...

printf(" ");i=1; Print 18 spaces, i=2 print 16 spaces.

for(k=1;k<=i;k++) third-layer loop.

printf("%4d", i );Print the value of i.

printf(" ");Line breaks.

The steps are given by everyone.

This problem is of difficulty to C language entry level, and the solution is very simple, only need to pass a simple if....else statement. The details are as follows:

#include

using namespace std;

int main()

int a;

cout<<"Enter the grade:";

cin>>a;

if(a>limb rotten 0 | a <=100)elseelsereturn 0;

p++ is p=p+1, which is a formula, because p already points to the first element of the array, and the address pointer of p (which stores the address) is moved back once, so that p points to the address of the next array element, and an integer can be read into the next array element when the next loop is executed.

Pointers, more abstract. ......For example, if a book is an array a, the first page is a[0], the second page is a[1], and so on. Then p is the bookmark of the book, at the beginning of the bookmark on the first page, that is, p points to a[0], at this time, the input assignment is "turn to the page of the bookmark, write a value".

&a[0] is equivalent to a+0, which is equivalent to a, and because the assignment statement p=a, it is equivalent to p

&a[0] is equivalent to a+1, i.e., p+1

The same goes for the follow-up

It should be: 353

bSince there are no curly braces after if, this one only has t=a; This statement is t=a under this judgment;

The value of t after this sentence is executed is 3

a=c;The value of a after this sentence is executed is 5

c=t;The value of c after this sentence is executed is 3

aSince there are no curly braces after if, t=b; In this judgment, but a=5, b=4, c=3, because the condition is not satisfied, so t=b; Not executed.

b=a;The value of b after this sentence is executed is 5

a=t;The value of a after this sentence is executed is 3

Therefore, the final output is 353

Landlord, do you change to: define(x,y) (x>y?x:y) Give it a try.

Change this place a bit, and the output is correct. Here's why.

Why, the specific reasons have not been analyzed.

The program itself is buggy. After the correction, the result of the operation is:

Error 1: In the first for loop, k-0 is changed to k=0;