1.打印
$
$$
$$$
$$$$
$$$$$
$$$$$$
#include <stdio.h>int main(void){const int ROWS = 6;int i,j;for (i=0;i<ROWS;i++){for (j=0;j<=i;j++){printf("$");}printf("\n");}return 0;}
2.打印
F
FE
FED
FEDC
FEDCB
FEDCBA
#include <stdio.h>int main(void){const int ROWS = 6;int i,j;int ch;for (i=0;i<ROWS;i++){for (j='F';j>=('F'-i);j--){printf("%c",j);}printf("\n");}return 0;}
3.打印
A
AB
ABC
ABCD
ABCDE
ABCDEF
#include <stdio.h>int main(void){const int ROWS = 6;int i,j;int ch;for (i=0;i<ROWS;i++){for (j='A';j<=('A'+i);j++){printf("%c",j);}printf("\n");}return 0;}
4.打印
A
BC
DEF
GHIJ
KLMNO
PQRSTU
#include <stdio.h>int main(void){const int ROWS = 6;int i,j;int ch='A';for (i=0;i<ROWS;i++){for (j=0;j<=i;j++){printf("%c",ch+j);ch++;}printf("\n");}return 0;}
5.打印
A
ABA
ABCBA
ABCDCBA
ABCDEDCBA
#include <stdio.h>#define N 5int main(void){int i,j,k,l,c;int ch='A';for(i=0;i<N;i++){for(j=N;j>i;j--){printf(" ");}for(k=ch;k<=i+ch;k++){printf("%c",k);}for(l=0,c=ch+i-1;l<=i-1;l++,c--){printf("%c",c);} printf("\n");}return 0;}
