38 lines
762 B
C
38 lines
762 B
C
/* Find F such that $E \cdot B = 0$ and $|B|^2-|E|^2 > 0$. */
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#include <stdio.h>
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#include <stdlib.h>
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main()
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{
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int a, b, b1, b2, b3, e1, e2, e3;
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printf("find F such that E.B = 0 and |B|^2-|E|^2 > 0\n");
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printf("-100 <= F[a][b] <= 100\n");
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printf("press any key to stop\n");
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for (;;) {
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if (kbhit())
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break;
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e1 = random(201) - 100;
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e2 = random(201) - 100;
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e3 = random(201) - 100;
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b1 = random(201) - 100;
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b2 = random(201) - 100;
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b3 = random(201) - 100;
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a = (b1 * b1 + b2 * b2 + b3 * b3) - (e1 * e1 + e2 * e2 + e3 * e3);
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b = e1 * b1 + e2 * b2 + e3 * b3;
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if (a > 0 && b == 0) {
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printf("\nE=(%d,%d,%d)\n", e1, e2, e3);
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printf("B=(%d,%d,%d)\n", b1, b2, b3);
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printf("|B|^2-|E|^2=%d\n", a);
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printf("E.B=%d\n", b);
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}
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}
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}
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