【c语言】键盘上键入一个算数表达式,计算其算数值,整个算数表达式要作 ...答:include "stdio.h"int main(int argc,char *argv[]){int i,k,t,m,p;char s[50];printf("Please enter an arithmetic expression(only + & -)...\n");scanf("%49s",s);for(p=m=t=i=0;s[i];i++){sscanf(s+i,"%d%n",&k,&t);p ? m-=k : m+=k;if(s[i+=t]==...