[linux环境下用c语言编程]1 2 3 4 5 6 7 8 9 10 11 12 13 #include <stdio.h> intmain() { intsum=0; inti; for(i=50;i<=100;i++) sum += i; printf("my name is zhang san, sum=%d\n", sum); } 编译:g...+阅读
#include "stdio.h" #include "stdlib.h" #include "ctype.h" int n=0; char record[20]; float product(); float change(); float muli() { float summ; summ=product(); while(record[n]=='-'||record[n]=='+') { switch(record[n]) { case '+':n++;summ+=product();break; case '-':n++;summ-=product();break; } } return summ; } float product() { float sump; sump=change(); while(record[n]=='*'||record[n]=='/') { switch(record[n]) { case '*':n++;sump*=change();break; case '/':n++;sump/=change();break; } } return sump; } float change() { float sumc; char rec[20],i=0; if(record[n]=='(') { n++; sumc=muli(); } if(record[n]==')') n++; while(isdigit(record[n])||record[n]=='.') { while(isdigit(record[n])||record[n]=='.') rec[i++]=record[n++]; rec[i]='\0'; sumc=atof(rec); } return sumc; } void main() { while(1) { n=0; scanf("%s",record); printf("%s=%g\n",record,muli()); } }
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