13 lines
200 B
C
13 lines
200 B
C
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#include <stdio.h>
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int main(void) {
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// initialization
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double a, b, c, d;
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scanf("%lf %lf %lf %lf", &a, &b, &c, &d);
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// print answer
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printf("%lf", (a + b) * (a - b) + c / d);
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return 0;
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}
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