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#include <stdio.h>
int main()
{
char c1, c2;
scanf("%4c%4c", &c1, &c2);
printf("%c,%c\n", c1, c2);
return 0;
}
c1[3]
c1[2]
c1[1]
c1[0]
c2[3]
c2[2]
base+1: c2[1]
base: c2[0]
| a[4] b[3]
| a[3] b[2]
| a[2] b[1]
base+1: c1 | a[1] b[0]
base: c2 | a[0]
int main(int argc, char * argv[])
{
char c1[4], c2[4];
scanf("%4c%4c", c1, c2);
printf("%c,%c\n", c1[0], c2[0]);
return 0;
}
// 正确的输入方法:A***B***回车