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//chapter21
//example21.2
//page463
R=10d3 // ohm
C=0.01d-6 // F
T=1.4*R*C
f=1/T
printf("time period of square wave = %.3f ms \n",T*1000)
printf("frequency of square wave = %.3f kHz \n",f/1000)
// the accurate answer for frequency is 7.143 kHz but in book it is given 7 kHz
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