课后习题4.2

/* isgraph();判断字符c是否为除空格外的可打印字符*/
#include<stdio.h>
#include<ctype.h>

int main(){
??? int i = 0 ;
??? int j = 0 ;//判断打印出的个数
??? for(i = 0 ; i<=127 ; i++){
??? ??? if(isgraph(i)){
??? ??? //打印可打印字符
??? ??? printf("%-3d-%c, ",i,i);
??? ??? ??? //每十个字符一行
??? ??? ??? if(++j % 10 == 0)
??? ??? ??? printf("\n");
??? ??? }
??? }
??? printf("\n");
??? return 0 ;
}