#include"stdio.h" int+main() { ++++double+a,b; ++++char+c; ++++scanf("%lf+%lf",&a,&b); ++++scanf("%c
时间: 2023-11-27 10:46:52 浏览: 183
根据提供的引用内容,这段代码的作用是从标准输入中读取两个double类型的数值,并将它们相加。但是在读取第一个double类型数值后,由于输入缓冲区中还有一个换行符,所以第二个scanf()函数读取到的是这个换行符,而不是第二个double类型的数值。因此,需要在第一个scanf()函数的格式字符串中加入一个空格,以忽略掉输入缓冲区中的换行符。修改后的代码如下:
```c
#include <stdio.h>
int main()
{
double a, b;
char c;
scanf("%lf %lf", &a, &b);
printf("%.2lf\n", a + b);
return 0;
}
```
相关问题
#include <stdio.h> #include <string.h> #include <stdlib.h> #define maxn 1000 char buf[maxn], str[maxn], signStack[maxn], ch[2]; int len, id, idSign, idAns, i, n; double ans[maxn]; void checkSign(char sign){ if(sign == '(') signStack[idSign++] =
sign;
else if(sign == ')'){
while(signStack[idSign-1] != '('){
char op = signStack[--idSign];
double b = ans[--idAns], a = ans[--idAns];
if(op == '+') ans[idAns++] = a + b;
else if(op == '-') ans[idAns++] = a - b;
else if(op == '*') ans[idAns++] = a * b;
else if(op == '/') ans[idAns++] = a / b;
}
idSign--;
}
else if(sign == '+' || sign == '-'){
while(idSign > 0 && signStack[idSign-1] != '('){
char op = signStack[--idSign];
double b = ans[--idAns], a = ans[--idAns];
if(op == '+') ans[idAns++] = a + b;
else if(op == '-') ans[idAns++] = a - b;
else if(op == '*') ans[idAns++] = a * b;
else if(op == '/') ans[idAns++] = a / b;
}
signStack[idSign++] = sign;
}
else if(sign == '*' || sign == '/'){
while(idSign > 0 && (signStack[idSign-1] == '*' || signStack[idSign-1] == '/')){
char op = signStack[--idSign];
double b = ans[--idAns], a = ans[--idAns];
if(op == '*') ans[idAns++] = a * b;
else if(op == '/') ans[idAns++] = a / b;
}
signStack[idSign++] = sign;
}
}
int main(){
while(fgets(buf, maxn, stdin) != NULL){
len = strlen(buf);
id = idSign = idAns = 0;
memset(ans, 0, sizeof(ans));
memset(signStack, 0, sizeof(signStack));
for(i = 0; i < len; i++){
if(buf[i] == ' ' || buf[i] == '\n') continue;
if(buf[i] >= '0' && buf[i] <= '9'){
n = 0;
while(buf[i] >= '0' && buf[i] <= '9'){
n = n * 10 + buf[i] - '0';
i++;
}
ans[idAns++] = (double)n;
i--;
}
else{
checkSign(buf[i]);
}
}
while(idSign > 0){
char op = signStack[--idSign];
double b = ans[--idAns], a = ans[--idAns];
if(op == '+') ans[idAns++] = a + b;
else if(op == '-') ans[idAns++] = a - b;
else if(op == '*') ans[idAns++] = a * b;
else if(op == '/') ans[idAns++] = a / b;
}
printf("%.2f\n", ans[0]);
}
return 0;
}
请问这段代码实现了什么功能?
#include<stdio.h> int main (){ int a; double f1,f2; char b; scanf("%lf %d %c %lf",&f1,&a,&b,&f2); printf("%c %.2f %d %.2f",b,a,f1,f2); return 0; }哪里出错
在printf函数中,输出的参数顺序与格式字符串中的顺序不一致,应该按照格式字符串中的顺序输出,将参数顺序改为 `%c %d %.2f %.2f` 即可。正确的代码如下:
```c
#include <stdio.h>
int main () {
int a;
double f1,f2;
char b;
scanf("%lf %d %c %lf",&f1,&a,&b,&f2);
printf("%c %d %.2f %.2f",b,a,f1,f2);
return 0;
}
```
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