[纠错]用1+1/1!+1/2!+1/3!+、、、+1/n!计算e的近似值
#include<stdio.h>
float factorial(int n)
{ if(n==0) return 1;
else return n*factorial(n-1);
}
int main(void)
{ int i,c,m;
float e,sum=0;
scanf("%d",&m);
for(i=1;i<=m;i++)
{c=1/(factorial(i));
sum=sum+c;
}
e=sum;
printf("e=%f\n",&e);
return 0;
}

[解决办法]

C/C++ code

printf("e=%f\n",e);//输出的时候有错
[解决办法]
C/C++ code
c=1.0/(factorial(i));//这儿用1.0，不要用1
[解决办法]
C/C++ code
#include <stdlib.h>#include <stdio.h>float factorial(int n){     if(n==0 || n == 1)        return 1;    else         return n*factorial(n-1);}int main(void){     int i,m;    float e,sum = 0;    scanf("%d",&m);    for(i=1;i<=m;i++)    {         sum += 1.0/(factorial(i));    }    e=sum;    printf("e=%f\n", e);    system("pause");    return 0;}
[解决办法]
常量也有类型！

C++ Integer Constants
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.

Syntax

integer-constant :

decimal-constant integer-suffixopt
octal-constant integer-suffixopt
hexadecimal-constant integer-suffixopt
'c-char-sequence'

decimal-constant :

nonzero-digit
decimal-constant digit

octal-constant :

0
octal-constant octal-digit

hexadecimal-constant :

0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digit

nonzero-digit : one of

1 2 3 4 5 6 7 8 9

octal-digit : one of

0 1 2 3 4 5 6 7

hexadecimal-digit : one of

0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E F

integer-suffix :

unsigned-suffix long-suffixopt
long-suffix unsigned-suffixopt

unsigned-suffix : one of

u U

long-suffix : one of

l L

64-bit integer-suffix :

i64



C++ Floating-Point Constants
Floating-point constants specify values that must have a fractional part. These values contain decimal points (.) and can contain exponents.

Syntax

floating-constant :

fractional-constant exponent-partopt floating-suffixopt
digit-sequence exponent-part floating-suffixopt

fractional-constant :

digit-sequenceopt . digit-sequence
digit-sequence .

exponent-part :

e signopt digit-sequence
E signopt digit-sequence

sign : one of

+ 

digit-sequence :

digit
digit-sequence digit

floating-suffix :one of

f l F L