gcc 4.2.4
Version of implementation gcc of programming language Cgcc 4.2.4 is a bug-fix release, containing fixes for regressions in gcc 4.2.3 relative to previous releases of gcc.
Examples:
Factorial - C, Objective-C (67):
This example uses recursive factorial definition. Note that 13! and larger causes an overflow, so the last lines of the output look like this:
13! = 1932053504
14! = 1278945280
15! = 2004310016
16! = 2004189184
#include <stdio.h>
unsigned long long factorial(unsigned long long n)
{
if (n == 0) {
return 1;
} else {
return n * factorial (n - 1);
}
}
int main(void)
{
int n;
for (n = 0; n <= 16; n++) {
printf("%i! = %lld\n", n, factorial(n));
}
return 0;
}
CamelCase - C (282):
This example is based on character-wise string processing. fgets
here reads at most 99 characters into the string, and stops when it finds end-of-string character, so a long line might be split. C doesn’t provide boolean data type, so it has to be simulated using integer variable.
#include <stdio.h>
void main() {
char text[100],cc[100];
fgets(text, sizeof text, stdin);
int i,j=0,lastSpace=1;
for (i=0; text[i]!='\0'; i++)
if (text[i]>='A' && text[i]<='Z' || text[i]>='a' && text[i]<='z')
{ if (lastSpace>0)
cc[j] = toupper(text[i]);
else
cc[j] = tolower(text[i]);
j++;
lastSpace = 0;
}
else
lastSpace = 1;
cc[j]='\0';
printf("%s\n",cc);
}
Quadratic equation - C (370):
This example requires C99, since it uses complex
type introduced in it.
#include <stdio.h>
#include <complex.h>
#include <math.h>
void print(int ind, double complex x) {
printf("x%d = ", ind);
if (fabs(cimag(x)) < 1e-6)
printf("%f\n", creal(x));
else printf("(%f, %f)\n", creal(x), cimag(x));
}
int main() {
double A, B, C;
double D;
printf("A = ");
scanf("%lf", &A);
if (fabs(A)<1E-3) {
printf("Not a quadratic equation\n");
return 1;
}
printf("B = ");
scanf("%lf", &B);
printf("C = ");
scanf("%lf", &C);
A *= 2;
D = B*B-A*C*2.0;
if (fabs(D)<1E-3)
printf("x = %f", creal(-B/A));
else {
print(1, (-B+csqrt(D))/A);
print(2, (-B-csqrt(D))/A);
}
return 0;
}
Quadratic equation - C, Objective-C, C++ (216):
This example works both for C and C++, as well as for Objective-C which is superset of C.
#include <math.h>
#include <stdio.h>
int main()
{
int A, B, C;
double D;
printf("A = ");
scanf("%d", &A);
if (A == 0) {
printf("Not a quadratic equation.\n");
return 0;
}
printf("B = ");
scanf("%d", &B);
printf("C = ");
scanf("%d", &C);
D = B * B - 4 * A * C;
if (D == 0) {
printf("x = %f\n", -B / 2.0 / A);
return 0;
}
if (D > 0) {
printf("x1 = %f\nx2 = %f\n",
(-B + sqrt(D)) / 2.0 / A, (-B - sqrt(D))/ 2.0 / A);
} else {
printf("x1 = (%f, %f)\nx2 = (%f, %f)\n",
-B / 2.0 / A, sqrt(-D) / 2.0 / A, -B / 2.0 / A, -sqrt(-D) / 2.0 /A);
}
return 0;
}
Hello, World! - C, Objective-C, C++ (68):
#include <stdio.h>
int main()
{
printf("Hello, World!\n");
return 0;
}
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