Classic C Program (19/20)-EEWORLD

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Title: Print stairs and print two smiling faces above the stairs.
1. Program analysis: Use i to control rows, j to control columns, and j controls the number of black squares output according to the change of i.
2. Program source code:
#include "stdio.h"
main()
{
int i,j;
printf("\1\1\n");/*Output two smiling faces*/
for(i=1;i<11;i++)
　{
　for(j=1;j<=i;j++)
　　printf("%c%c",219,219);
　printf("\n");
　}
}

Title: Output a chess board.
1. Program analysis: Use i to control rows, j to control columns, and output black or white squares based on the sum of i+j.
2. Program source code:
#include "stdio.h"
main()
{
int i,j;
for(i=0;i<8;i++)
　{
　　for(j=0;j<8;j++)
　　　if((i+j)%2==0)
　　　　printf("%c%c",219,219);
　　　else
　　　　printf(" ");
　　　printf("\n");
　}
}

Title: Output 9*9 formula.
1. Program analysis: Consider rows and columns, a total of 9 rows and 9 columns, i controls rows, j controls columns.
2. Program source code:
#include "stdio.h"
main()
{
　int i,j,result;
　printf("\n");
　for (i=1;i<10;i++)
　　{ for(j=1;j<10;j++)
　　　　{
　　　　　result=i*j;
　　　　　printf("%d*%d=%-3d",i,j,result);/*-3d means left alignment, occupies 3 digits*/
　　　　}
　　　printf("\n");/*New line after each line*/
　　}
}

Title: Output special patterns. Please run it in C environment and take a look. Very Beautiful!
1. Program analysis: There are 256 characters in total. Different characters have different patterns.　　　　　　
2. Program source code:
#include "stdio.h"
main()
{
char a=176,b=219;
printf("%c%c%c%c%c%c\n",b,a,a,a,b);
printf("%c%c%c%c%c%c\n",a,b,a,b,a); printf("%c%c%c%c%c%c\n",a,a,b,a,a);
printf("%c%c%c%c%c%
c\n",a,b,a,b,a); printf("%c%c%c%c%c%c\n",a,b,a,b,a);
printf("%c%c%c%c%c%c\n",b,a,a,a,b);}

Title: Use the * symbol to output the pattern of the letter C.
1. Program analysis: You can first use the * symbol to write the letter C on paper, and then output it in separate lines.
2. Program source code:
#include "stdio.h"
main()
{
printf("Hello C-world!\n");
printf(" ****\n");
printf(" *\n");
printf(" * \n");
printf(" ****\n");
}

Reference address：Classic C Program (19/20)

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