题目
编程基础题，就是输入两个数A、B然后获得A-B的结果
代码
简单版
// CopyRight (c) HuangJunjie@SYSU(SNO:13331087). All Rights Reserved.
#include<iostream>
using std::cin;
using std::cout;
int main() {
int a, b;
cin >> a >> b;
cout << a - b << endl;
return 0;
}
高精度版
// CopyRight (c) HuangJunjie@SYSU(SNO:13331087). All Rights
#include<stdio.h>
#include<string.h>
char* strrev(char* str) {
char *h = str, *t = str, ch;
while (*t++) {}
t -= 2;
while (h < t) {
ch = *h;
*h++ = *t;
*t-- = ch;
}
}
void substruct(char *big, char *small, char* result) {
for (int i = 0; big[i] || small[i]; i++) {
if (big[i] < small[i]) {
big[i] += 10;
big[i + 1]--;
}
if (!small[i]) small[i] += '0';
result[i] = (big[i] - '0') - (small[i] - '0') + '0';
}
}
void Printf(char *c) {
int i = 0;
while (c[i++] == '0') {}
if (!c[i]) printf("0");
printf("%s", c + i - 1);
printf("\n");
}
int main() {
char a[100 + 1] = { 0 }, b[100 + 1] = { 0 }, c[100 + 1] = { 0 };
scanf("%s", a);
scanf("%s", b);
strrev(a);
strrev(b);
if (strlen(a) < strlen(b)) {
substruct(b, a, c);
printf("-");
} else if (strlen(a) > strlen(b)) {
substruct(a, b, c);
} else {
for (int i = strlen(a) - 1; i >= 0; i--) {
if (a[i] == b[i]) {
if (i) {
continue;
} else {
c[i] += '0';
}
} else if (a[i] > b[i]) {
substruct(a, b, c);
break;
} else if (a[i] < b[i]) {
substruct(b, a, c);
printf("-");
break;
}
}
}
strrev(c);
Printf(c);
return 0;
}
