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+clear
+//Initialisation
+c=100*10**-6 //capacitance in farad
+r=100*10**3 //resistance in ohm
+v=20 //volt
+t=25 //time in seconds
+e=2.71828 //mathematical constant
+
+//Calculation
+T=c*r //time in seconds
+v1=v*(1-e**(-t*T**-1)) //volt
+
+//Result
+printf("\n v = %.2f V",v1)
+