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Hi I have a piece of code that inserts a string into an array. I want to add an integer value (time stamp) to it but keeping the string format (this is essential for the rest of my application)
long int timestamp = 0;
static void joe(struct k_timer *timer_id){
if(bt_mesh_is_provisioned()){
char * tab[20];
timestamp += 1;
tab[0] = "test";
messagueages(&tab);
}
}
int messagueages(char *mes[]){
int err;
err = bt_mesh_chat_cli_message_send(&chat, mes[0]);
if (err){
LOG_WRN("Failed to send message: %d", err);
}
return 0;
}
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How to convert number/string into hexadecimal? For instance,
Input a word: My name is Laura
Hexadecimal output:...
Supposing that you have a word already stored in a char array, you could do
#include <string.h>
void print_in_hex(const char *string) {
size_t len;
len=strlen(string);
for (size_t k=0; k<len; k++) {
printf("%02x ", string[k]);
}
printf("\n");
}
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This code prints the array elements, but I can't understand how does k[x-1] gives the array elements.
#include<stdio.h>
int main()
{
int x[]={2,4,6,8,10},k=1;
while (k<=5)
{
printf ("%3d",k[x-1]);
k++;
}
return 0;
}
Array indexes start at 0 in C. An array like int x[]={2,4,6,8,10} will have a value x[0]=2 and so forth. Typically, when iterating through an array, a convention like this is used:
for (int i = 0; i < length; i++)
printf("%3d",x[i]);
Since the code you provided begins the indexing at 1, you have to subtract one to fetch the proper element.
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copy all characters from one character array to another without using strcpy function.
char s1[80],s2[80];
int i;
printf("input s2");
scanf("%s",&s2);
for(i=0;i<=strlen(s2);i++)
s1[i]=s2[i];
printf("s1:%s",s1);
Instead of scanf, using gets function for getting input with spaces.
#include<stdio.h>
int main()
{
char s1[80],s2[80];
int i;
printf("input s2");
// scanf("%c",&s2);
gets(s2);
printf("%d",strlen(s2));
for(i=0;i<strlen(s2);i++)
{
s1[i]=s2[i];
}
printf("s1:%s",s1);
}
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i am making a program in C where i ask the user 10 questions and i have a list of 20 questions. I want the machine to randomly pick and ask any 10 questions. Can anyone help me how to do that?
As an outline:
struct Q {
char *q;
int hasbeenselected;
} q[20];
int n;
//
// fill q with your questions and set hasbeenselected to 0;
srand(time(NULL));
for (int i=0; i<10; i++) {
do {
n= rand()%20;
} while (q[n].hasbeenselected==1);
// now ask question q[n].q
q[n].hasbeenselected= 1;
}
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#include <stdio.h>
#define number 0
main()
{
int i;
for (i = 0; i < 5; i++)
{
number++;
}
printf("Number is: %d", number);
}
No, 0 is substitued for number by the preprocessor before the compiler gets to work.
The compiler issues a diagnostic when it sees 0++;