"Passord safe program" ? C hjelp

[SmoothCriminal]

Hei prøver og lage en simpel passord safe

 

#include <stdio.h>
int main()
{
char name[20];
char color[20];
printf("What is your name?");
scanf("%s",name);
if scanf("%s",name) = David;
printf("What is your favorite color?");
else printf ("get away from the pc!");	
scanf("%s",color);
if scanf("%s",color) = blue
printf("%s’s favorite color is %s\n",name,color, oh the password is david);
return(0);
}

 

Så får jeg error slik

 

john@ubuntu:/home/prog/C$ gcc safe.c -o safe
safe.c: In function ‘main’:
safe.c:8: error: expected ‘(’ before ‘scanf’
safe.c:8: error: ‘David’ undeclared (first use in this function)
safe.c:8: error: (Each undeclared identifier is reported only once
safe.c:8: error: for each function it appears in.)
safe.c:10: error: ‘else’ without a previous ‘if’
safe.c:12: error: expected ‘(’ before ‘scanf’
safe.c:12: error: ‘blue’ undeclared (first use in this function)

 

Noen som vett hvordan man skal gjøre dette ?

 

Takk ;D

[Hårek]

Denne inneholder minst 3 feil: if scanf("%s",name) = David;

Les litt om strncmp. http://www.cplusplus.com/reference/clibrary/cstring/strncmp/

[SmoothCriminal]

Denne inneholder minst 3 feil: if scanf("%s",name) = David;

Les litt om strncmp. http://www.cplusplus.com/reference/clibrary/cstring/strncmp/

 

Ok endret litt her nå

 

#include <stdio.h>
int main()
{
char name[20];
char color[20];
printf("What is your name?");
sc
anf("%s",name);
if strncmp scanf("%s",name) == "David";
else printf ("get away from the pc!");	
printf("What is your favorite color?");
else printf ("get away from the pc!");	
scanf("%s",color);
if strncmp scanf("%s",color) == "blue");
printf("%s’s favorite color is %s\n",name,color, "oh the password for facebook is david");
return(0);
}

 

Men så kom errorene

 

john@ubuntu:/home/prog/C$ gcc safe.c -o safe
safe.c: In function ‘main’:
safe.c:7: error: ‘sc’ undeclared (first use in this function)
safe.c:7: error: (Each undeclared identifier is reported only once
safe.c:7: error: for each function it appears in.)
safe.c:8: error: expected ‘;’ before ‘anf’
safe.c:9: error: expected ‘(’ before ‘strncmp’
safe.c:9: error: ‘strncmp’ undeclared (first use in this function)
safe.c:12: error: ‘else’ without a previous ‘if’
safe.c:14: error: expected ‘(’ before ‘strncmp’
safe.c:14: error: expected statement before ‘)’ token

[Hårek]

Den var jo svært enkel å se. Du har uforvarende lagt inn et linjeskift midt i sc anf

 

Du trenger forresten ikke å lese inn 'name' to ganger.

Les det først, så tar du if (strncmp (name, "David", 5) == 0)

Du har rotet kraftig med syntaksen her.

 

Prøv deg fram litt av gangen, det tar sin tid å lære disse tingene.

 

 

 

 

 

 

[SmoothCriminal]

Programmet er "ferdig, litt (STORE) bugger"

 

#include <stdio.h>
int main()
{
char name[20];
char color[20];
printf("What is your name?");
scanf("%s",name);
if (strcmp(name,"david") == 0);
else printf ("get away from the pc!");
printf("What is your favorite color?");
scanf("%s",color);
if (strcmp(name,"blue") == 0);
else printf("get away from the pc!");
printf("%s’s favorite color is %s\n",name,color, "oh the password for facebook is david");
return(0);
}

 

Så skjer dette

 

john@ubuntu:/home/prog/C$ ./safe
What is your name?david
What is your favorite color?blue
get away from the pc!david’s favorite color is blue
john@ubuntu:/home/prog/C$ ./safe
What is your name?notthis
get away from the pc!What is your favorite color?whatareyounotstopping?          
get away from the pc!notthis’s favorite color is whatareyounotstopping?

[Hårek]

Du leser til 'color' men bruker 'name'.

scanf("%s",color);

if (strcmp(name,"blue") == 0);

 

 

Tenk dessuten litt på logikken med if (true) {ingenting} - else {statement}.

Prøv heller if (not true) {statement}

 

 

 

 

[SmoothCriminal]

Du leser til 'color' men bruker 'name'.

scanf("%s",color);

if (strcmp(name,"blue") == 0);

 

 

Tenk dessuten litt på logikken med if (true) {ingenting} - else {statement}.

Prøv heller if (not true) {statement}

 

Ok da er programmet helt ferdit (Tror jeg)

 

 

 /***************************/
/**Program made by Nesiory**/
/***************************/
#include <stdio.h>
int main()
{
   char name[20];
   char color[20];
   char key[20];

/**Question A**/
   printf("What is your name?");
   scanf("%s",name);
   if (strcmp(name,"david") != 0)   		/** Change (name,"ThisChange") to change name **/
   {
     	puts("Get away from the pc!");
     	sleep(5);
return(0);
   }

/**Question B**/
   printf("What is your favorite color?");
   scanf("%s",color);
   if (strcmp(color,"blue") != 0)  		/** Change (color,"ThisChange") to change color **/
   {
puts("Get away from the pc!");
sleep(5);
return(0);
   }

/**Question C**/
   printf("What is the master key?");
   scanf("%s",key);
   if (strcmp(key,"david") != 0)  		/** Change (Key,"ThisChange") to change master key **/
   {
puts("Get away from the pc!");
   	sleep(5);
   	return(0);
   }

/**Sulution**/
/** Change (Password is "ThisChange"\n",name,color) to change the final password **/
   printf("%s’s favorite color is %s, oh i forgot...the password is david\n",name,color );
   return(0);
}

 

 

Endret 2. januar 2011 av nesiory