How to scan double in array? C language

Question

It's work on integer, but why doesnt work in float

Answer 1

Briana do like that:
scanf("%lf%*c ", arr[i]);
%lf reads and save the double
%*c reads snd discard a character (in your case a comma)
" " reads and discard a space

Answer 2

Martin Taylor the spacing is not a problem - the spaces before the values read by format specifier are skipped, if you want to also allow spaces before the commas you can add a single space before the commas in a format specifier (space in format string means "skip all the whitespaces in current position").

In general you are right - once you need to read complicated input, it is better to use special tools. Strtok also has its problems (modifying the input string, having global state)

Answer 3

Briana
Try this example:

https://code.sololearn.com/cGSXq436ena4/?ref=app

Answer 4

Something like this?

float arr[4];
for(int i=0;i<4;i++){
scanf("%f",&arr[i]);
printf("%f\n",arr[i]);
}

Briana this should do.

float arr[4];
float sum = 0.0;
for(int i=0;i<4;i++){
scanf("%f",&arr[i]);
printf("%.2f\n",arr[i]);
sum += arr[i];
}

printf("sum = %.2f",sum);

Answer 5

What is your input and expected result?

Answer 6

Briana my previous code works fine, you just had to change the array length.

https://code.sololearn.com/c0GLoeMD0dop/?ref=app

Answer 7

Just an addition. Since the title also mentions double, the format specifier to read double is %lf (since the pointers point to different sized objects scanf needs to know the size)

Answer 8

Briana as an alternative, if you want to read comma separated values just put commas in the format string - like in the attached code (the spaces will be skipped by default).

https://code.sololearn.com/czuCW75WA2g3/?ref=app

Answer 9

Ozlem Guldurdnnb
https://www.sololearn.com/discuss/1316935/?ref=app

Answer 10

Martin Taylor in your case you just need to prepend %*c with another space to skip spaces before. See the code i attached to my previous post. You can change spaces in input line and see it treats extra spaces (or no spaces) just fine

https://code.sololearn.com/czuCW75WA2g3/?ref=app

Answer 11

Avinesh ya.. But i want %.2f and sum all array. It doesnt work

Answer 12

Avinesh it doesnt work

Answer 13

Avinesh my input is 12 number of float array like 10.00, 10.10, 10.20, and so on. The expected result is the sum of all number

Answer 14

Avinesh thankyou. But how if the input contain comma and space?