例3.1 # include“ stdio.h main( i char a, b; a=o’;b="k; putchar(a); putchar(b); putchar(n); putchar(a); putchar(n) putchar(b); putchar (n); 运行结果: ok k例3.1 #include “stdio.h” main( ) { char a,b; a=‘o’; b=‘k’; putchar(a); putchar(b); putchar(‘\n’); putchar(a); putchar(‘\n’); putchar(b); putchar(‘\n’); } 运行结果： ok o k