#How do I Get a number from user in safe way?

22 messages · Page 1 of 1 (latest)

dawn tartan
#

hello, I wanted to ask how to get a number from user in C within range and will ask again if value is not in range and if in range continue!

typedef struct {
    uint8_t IpV4_1;//unsigned in 0-255 (8 bit int)
    uint8_t IpV4_2;
    uint8_t IpV4_3;
    uint8_t IpV4_4;
    uint8_t IpV4_SubNetMask;
    
}IPFormater;
IPFormater IPformater1;

 printf("Enter the target IP address: format X.X.X.X\\X ,\\ = SubNetMask(0-32) Enter 0 in subnet mask to get the defult IP address you entered ");
 scanf("%hhu.%hhu.%hhu.%hhu\\%hhu", &IPformater1.IpV4_1, &IPformater1.IpV4_2, &IPformater1.IpV4_3, &IPformater1.IpV4_4, &IPformater1.IpV4_SubNetMask);

I don't want values higher then 255 and lower then 0

robust fractalBOT
#

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chilly cypress
# 
int i = NOT_IN_RANGE
while (i > MAX || I < MIN){
   scanf into i 
}
dawn tartan
#

WHAT IS NOT_IN_RANGE?

chilly cypress
#

you start with a value that is not in range
so you enter the loop
then you update the value
-> if its in range you exit the loop
-> if not you scan the value again

dawn tartan
#

Let me chack one second second

#

how do I use this?

chilly cypress
dawn tartan
#

stoppp

#

I really need help did you mean like

int i = 256
while (i > 255 || I < 0){
   scanf into i 
}

?
what is scanf into i?

dawn tartan
chilly cypress
#

did you ever use scanf

dawn tartan
#

yes but I don't know what is this into i and what is I?

#

did you mean?
int i = 256;
while (i > 255 || i < 0) {
scanf("%d", &i);
}?

dawn tartan
dawn tartan
#

unsinged so if you enter bigger number it just take the % I think

#

you can check it yourself

#

so I need help more

dawn tartan
#

!cloce

#

!close