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116 rivejä
3.1 KiB
116 rivejä
3.1 KiB
#!./main
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <assert.h>
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int x = 21;
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int baz(int xx, ...) { return 42; }
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int foo(void) { return x + x; }
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char *bar(void) { return "bye bye"; }
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struct Point { float x, y; };
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struct Point pt;
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float Point_magnitude(struct Point p) { return sqrtf(p.x * p.x + p.y * p.y); }
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int gbl[5];
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int gg[] = { -2, ~2, !2, 6+7, 6*7 };
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int main(int argc, char **argv)
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{
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printf("hello, world %d %s\n", foo(), bar());
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printf("baz is %d %d %d\n", baz(1), baz(1, 2), baz(1, "two", 3));
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printf("%d\n", 6*7);
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int x = 42;
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int *p = &x;
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printf("x is %d p is %p\n", *p, p);
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*p = 666;
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printf("x is %d %d\n", x, *p);
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x = 123;
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printf("x is %d %d\n", x, *p);
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for (x = 0; x < 10; ++x) {
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if (x == 5) printf("%%");
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printf("%d ", x);
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}
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printf("\n");
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while (x > 0) printf("%d ", --x);
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printf("\n");
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printf("%d\n", sizeof(char *));
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int i, array[5] = { 2, 3, 5, 7, 11 };
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printf("array size %d\n", sizeof(array));
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for (i = 0; i < 5; ++i) printf("%d\n", array[i]);
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for (i = 0; i < 5; ++i) array[i] = i*i;
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for (i = 0; i < 5; ++i) printf("%d\n", array[i]);
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for (i = 0; i < 5; ++i) array[i] = array[i] * array[i];
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for (i = 0; i < 5; ++i) printf("%d\n", array[i]);
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printf("%p\n", array);
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printf("%p\n", array + 10);
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p = array;
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printf("%p\n", p);
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printf("%p\n", array+5);
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while (p < array+5) printf("%d\n", *p++);
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printf("%p\n", array);
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printf("%p\n", &array);
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printf("%p\n", &array[0]);
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assert(array == &array);
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assert(array == &array[0]);
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assert(&array == array);
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assert(&array[0] == array);
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char *sliteral = "string literal";
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char sarray[] = "string array";
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char tarray[13] = "string array";
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char uarray[20] = "string array";
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char varray[12] = "string array";
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printf("%zd %s\n", sizeof(sliteral), sliteral);
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printf("%zd %s\n", sizeof(sarray), sarray);
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printf("%zd %s\n", sizeof(tarray), tarray);
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printf("%zd %s\n", sizeof(uarray), uarray);
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printf("%zd %s\n", sizeof(varray), uarray); // varray has unterminated string
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printf("gbl %f %f -> %f\n", pt.x, pt.y, Point_magnitude(pt)); // global data is filled with zero
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pt.x = 3.0;
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pt.y = 4.0;
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printf("gbl %f %f -> %f\n", pt.x, pt.y, Point_magnitude(pt));
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struct Point qt;
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printf("lcl %f %f -> %f\n", qt.x, qt.y, Point_magnitude(qt)); // local data is random
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qt.x = 3.0;
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qt.y = 4.0;
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printf("lcl %f %f -> %f\n", qt.x, qt.y, Point_magnitude(qt));
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struct Point rt = { 5.0, 12.0 };
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printf("%f %f -> %f\n", rt.x, rt.y, Point_magnitude(rt));
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for (i = 0; i < 5; ++i) printf("g %d\n", gbl[i]); // global data is filled with zero
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int lcl[5];
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for (i = 0; i < 5; ++i) printf("l %d\n", lcl[i]); // local data is random
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int ll[] = { -2, ~2, !2, 6+7, 6*7 };
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for (i = 0; i < sizeof gg / sizeof(int); ++i) printf("g %d ", gg[i]); printf("\n");
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for (i = 0; i < sizeof ll / sizeof(int); ++i) printf("l %d ", ll[i]); printf("\n");
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printf("passed\n");
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return 0;
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}
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// Local Variables:
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// mode: c
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// End:
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