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I want to display the contents of an array with type double that has a length of 5 without using the [ ] indexing . I can only use a for loop and pointer techniques.
How can you achieve that ?
Can anyone give me a brief explanation of pointers as I have no idea how to use them exactly ?
The array indexing operator is a shorthand for hiding pointer arithmetic.
So if you have an array like this:
double a[5];
Instead of using this expression:
a[1]
You can use this:
*(a + 1)
Related
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There is a complex statement in my textbook:
int (*f(float (*)(long),char *))(double);
I want to create an example for illustrating how to use this statement, although I understand the meaning of the statement, it's hard for me to write the example. Can anyone help me?
P.S.: C language.
int (*f(float (*)(long),char *))(double)
f is a function that has 2 parameters of type
float (*)(long), << pointer to function long=>float
char * << string
and returns
(int)(*)(double) << a pointer to a function double=>int
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I want to print out each integer of an int individually using a for loop. I am doing this because I want to print things in between some of the single ints. So if the number was 4564, I want to print out 4 5 6 4. Is there a quick way to do this?
I know how to do it in java but I am new to C and am not sure.
Something like this shall help
while(num!=0) {
printf("%d", num%10); //your last digit, you can store it in an array of characters as well
num = num/10 ;
}
Note : you've got to reverse the order while using the digits
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I have a challenge question like "What is your favorite movie?". There could be any question like this. I need last word of the question i.e. movie. without question mark.
Try this
String question = "What is your favorite movie";
String lastWord = question .substring(question .lastIndexOf(" ")+1);
When you select the element containing your challenge question, you can call .getText() (in Java; similar in other languages) to get the text inside. Then, you can use regular expressions or substring utilities in your language to strip out the last word.
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How can i combine one increment and one decrement statements into one single statement in C language.
ex: a++ and b-- into one single statement.
Write a++,b--;
Two expressions separated by a comma are evaluated left to right.
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I'm trying to decimate a given vector with a logarithmic rule instead of a linear one.
e.g.:
The given vector has 100 elements. I want to reduce it to a vector of 10 elements that are the same elements of the starting vector taken with a logarithmic rule on the int interval [0,99].
I hope to be clear enough. Any help is appreciated !
Have a nice day !
In pseudo-code :
int n; // Length of subsampled array
for i:
new_array[i] = array[(int)(log(i)/log(n)*length(array))]
Is that what you are trying to do ?