#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void arithmetic(char *pInputStr1, long lInputLen, char *pOutputStr) {
char *pch = NULL;
char *cur = malloc(lInputLen + 1);
*pOutputStr = '\0';
int oprand1 =0, oprand2 = 0, count = 0;
char *operator = NULL;
strcpy(cur, pInputStr1);
pch = strtok(cur, " ");//获取第一个子字符串
while(pch != NULL) {//继续获取其它子串
if (count == 0) {
oprand1 = atoi(pch);
} else if(count == 2) {
oprand2 = atoi(pch);
} else {
operator = pch;
}
pch = strtok(NULL, " ");
count ++;
}
if (strcmp(operator, "+") == 0){
oprand1 += oprand2;
sprintf(pOutputStr + strlen(pOutputStr), "%d", oprand1);
}else if (strcmp(operator, "-") == 0){
oprand1 -= oprand2;
sprintf(pOutputStr + strlen(pOutputStr), "%d", oprand1);
}else {
sprintf(pOutputStr + strlen(pOutputStr), "%d", 0);
printf("格式错误\n");
}
free(cur);
}
int main(void) {
char pInputStr[128] = {"3 + 5"};
char pOutputStr[128] = {0};
arithmetic(pInputStr, strlen(pInputStr), pOutputStr);
printf("输出：%s\n", pOutputStr);
return 0;
}