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diff --git a/3446/CH4/EX4.2/Ex4_2.sce b/3446/CH4/EX4.2/Ex4_2.sce
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+// Exa 4.2
+// To calculate SNR for L=32, 64, 128, and 256.
+
+clc;
+clear all;
+
+Rt=1; //Resistance(ohm)
+//L= Number of quantization values
+L1=32;
+L2=64;
+L3=128;
+L4=256;
+
+// solution
+// L=2^R i.e R=log2(L);
+R1=log2(L1);
+R2=log2(L2);
+R3=log2(L3);
+R4=log2(L4);
+
+//P=A^2/2; //average power of signal
+//sig^2=0.333*A^2*2^(-2*Rt); //Avg quantization noise power
+//SNR=P/sig^2;
+// SNR(dB)=1.8+ 6R;
+
+SNR1=1.8+6*R1;
+SNR2=1.8+6*R2;
+SNR3=1.8+6*R3;
+SNR4=1.8+6*R4;
+
+printf('For L=32, SNR is %.1f dB\n ',SNR1);
+printf('For L=64, SNR is %.1f dB\n ',SNR2);
+printf('For L=128, SNR is %.1f dB\n ',SNR3);
+printf('For L=256, SNR is %.1f dB\n ',SNR4);