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void fade(ImagenBMP *imagen1, ImagenBMP *imagen2, int f) {
float v = (float)f/255;
for (int i = 0; i < imagen1->tamanyo; i++) {
imagen1->datos[i] = (imagen1->datos[i] - imagen2->datos[i])*v + imagen2->datos[i];
}}; //end of fade
It's supose to fade two images into a single one.
If you rewrite the equation, you will end up with:
imagen1->datos[i] = v*imagen1->datos[i] + (1-v)*imagen2->datos[i];
This is how the blend works. You are specifying how much of the first image (out of 255 parts) should be included in the function parameter f, 255-f parts will be included from the second image.
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I am trying to get the value of "w" but when I do the For loop ,it only gives me 4 results:
Problem:
https://imgur.com/a/F9wPKF7
Code:
#include <stdio.h>
#include <math.h>
int main() {
int x,e,w;
float a = 2.5;
for (x=1; x<6; x++) {
if (x>a) {
w = x*cbrt(x-a);
}
else if (x=a) {
w = x*sin(a*x);
}
else if (x<a) {
w = pow(e,(-a*x))*cos(a*x);
}
printf("%d ",x);
}
return 0;
}
Output:
2 3 4 5
I know in this program i dont search for the value of w but I wanted to see why does it give me only 4 number instead of 5? why is the one missing and ow can I solve it? Thank you
else if (x=a) should beelse if (x==a)
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int frequency(string note)
{
int i;
float f;
int n=0;
float octave= note[strlen(note)-1];
if(strlen(note)==3)
{
if(note[1]=='#')
{
n+=1;
}
else if(note[1]=='b')
{
n-=1;
}
}
if(note[0]=='B')
{
n+=2;
}
else if(note[0]=='C')
{
n-=9;
}
else if(note[0]=='D')
{
n-=7;
}
else if(note[0]=='E')
{
n-=5;
}
else if(note[0]=='F')
{
n-=4;
}
else if(note[0]=='G')
{
n-=2;
}
n+=(octave-4.0)*12.0;
float p= n/12.0;
f=(int)(round(pow(2.0,p)*440.0));
return f;
}
So basically whenever I run this code I get an error stating "runtime error: value 7.3641e+16 is outside the range of representable values of type 'int'"
Then the value returned is just-2147483648. I've looked it up online and haven't found an answer that helps me with my code. Also this was made in the cs50 IDE so there are a bunch of commands and things that are imported. My program compiles properly and it can run so how do I fix this?
Frequencies of notes of the chromatic scale are not integers in the first place.
If you are passed a two character string like Cb, you get a stupidly huge octive with a frequency way too high.
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Closed 6 years ago.
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I'm trying to extract a small substring from a string of words in c. I did it in a previous program written in python using this code:
out_block = "".join(re.findall(r'.FT off(.*?).FT on',finaltext,re.DOTALL))
The code extracts all the characters in between .FT off and .FT onand passes it to out_block as a string.
I wanted to know how to do the same using regular expressions but in C
How would I convert this code to a C code that does the exact same thing?
Basicly you do this:
#include <sys/types.h>
#include <regex.h>
regex_t finder;
if (0 != regcomp(&finder, "regex-string", 0)) { error handling }
You might need to adjust your regex string above.
After that you can do any number of times:
regmatch_t match[N_MATCH];
if (0 == regexec(&finder, "haystack", N_MATCH, match, 0)) {
process matches
} else {
no match
}
Clean up using regfree and get error messages (in regcomp) using regerror.
For more details, consult man page regex(3).
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Closed 9 years ago.
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A logical question asked in the aptitude test.
if(______)
{
printf("Hi");
}
else
{
printf("Hello");
}
What condition should be provided in place of _____ to get the following output ?
HelloHello
You do not need to give control to else twice. All you need is a false condition with a side effect of printing the other "Hello", for example
if (printf("Hello") == 0) // this condition is false, because printf returns the number of chars written
{
printf("Hi");
}
else
{
printf("Hello");
}
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In my project I have one file as input, and I need the output file with a new extension. Suppose my input file is file.txt here as name. I need output file as file.dic. I tried the following.
fpout = fopen(strcat(name,".dic"), WRITE_ONLY);
I know it's not the correct way. But what should I do to get the file name as file.dic?
char * newstr;
newstr = strstr (name,"txt");// name = "file.txt"
strncpy (newstr,"dic",3);
//newstr = file.dic
this will replace the file.txt with file.dic
If you just want to change the file extension, this is an easy way to do it.
int lenght;
lenght = strlen(name);
name[lenght - 1] = c;
name[lenght - 2] = i;
name[lenght - 3] = d;
name[lenght - 4] = .;
you can also use while, and while you don't check a '.' increment i, then change the extension in the same way.
or
strncpy (strstr (name,"txt"),"dic",3);