46 lines
903 B
C
46 lines
903 B
C
|
#include <ctype.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#define SIZE 100
|
||
|
|
|
||
|
|
int getfloat(double *pf) {
|
||
|
|
int c, sign, dec;
|
||
|
|
while (isspace(c = getchar())) /* ignore whitespace */
|
||
|
|
;
|
||
|
|
if (c != EOF && c != '.' && c != '+' && c != '-' && !isdigit(c)) {
|
||
|
|
ungetc(c, stdin); // not a number
|
||
|
|
return c;
|
||
|
|
}
|
||
|
|
sign = (c == '-') ? -1 : 1;
|
||
|
|
if (c == '+' || c == '-')
|
||
|
|
c = getchar();
|
||
|
|
|
||
|
|
for (*pf = 0; isdigit(c); c = getchar()) {
|
||
|
|
*pf = 10 * *pf + (c - '0');
|
||
|
|
}
|
||
|
|
|
||
|
|
if (c != '.' && c != EOF) {
|
||
|
|
ungetc(c, stdin); // not a number after decimal
|
||
|
|
return c;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (c == '.') {
|
||
|
|
c = getchar();
|
||
|
|
for (dec = 1; isdigit(c); c = getchar(), dec++)
|
||
|
|
*pf = *pf + (double)(c - '0') / (10 * dec);
|
||
|
|
}
|
||
|
|
|
||
|
|
*pf *= sign;
|
||
|
|
|
||
|
|
if (c != EOF)
|
||
|
|
ungetc(c, stdin);
|
||
|
|
return c;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
int n;
|
||
|
|
double array[SIZE];
|
||
|
|
for (n = 0; n < SIZE && getfloat(&array[n]) != EOF; n++)
|
||
|
|
;
|
||
|
|
printf("%lf", array[0]);
|
||
|
|
}
|