gcc 4.2.4

Version of implementation gcc of programming language C

gcc 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円'; 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円';
 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;
}