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| module lab1(sw,hex0,hex1,hex2,hex3,hex4,hex5,hex6,hex7); input[17:0] sw; output[6:0] hex0,hex1,hex2,hex3,hex4,hex5,hex6,hex7; reg[4:0] h7,h6,h5,h4,h3,h2,h1,h0; reg[15:0] o1,o2,s; reg[17:0] sw0; always@(*) begin if(sw[3:0]>9) sw0[3:0]=9; else sw0[3:0]=sw[3:0]; if(sw[7:4]>9) sw0[7:4]=9; else sw0[7:4]=sw[7:4]; if(sw[11:8]>9) sw0[11:8]=9; else sw0[11:8]=sw[11:8]; if(sw[15:12]>9) sw0[15:12]=9; else sw0[15:12]=sw[15:12]; if(sw[17:16]==0) begin h7=16; h6=16; h5=16; h0=sw[15:0]%10; h1=sw[15:0]/10%10; h2=sw[15:0]/100%10; h3=sw[15:0]/1000%10; h4=sw[15:0]/10000; show(h0,hex0); show(h1,hex1); show(h2,hex2); show(h3,hex3); show(h4,hex4); end else if(sw[17:16]==1) begin o1=sw0[15:12]*10+sw0[11:8]; o2=sw0[7:4]*10+sw0[3:0]; s=o1+o2; h7=sw0[15:12]; h6=sw0[11:8]; h5=sw0[7:4]; h0=s%10; h1=s/10%10; h2=s/100; h3=16; h4=sw0[3:0]; show(h0,hex0); show(h1,hex1); show(h2,hex2); show(h3,hex3); show(h4,hex4); show(h5,hex5); show(h6,hex6); show(h7,hex7); end else if(sw[17:16]==2) begin o1=sw0[15:12]*10+sw0[11:8]; o2=sw0[7:4]*10+sw0[3:0]; s=o1*o2; h7=sw0[15:12]; h6=sw0[11:8]; h5=sw0[7:4]; h0=s%10; h1=s/10%10; h2=s/100%10; h3=s/1000%10; h4=sw0[3:0]; show(h0,hex0); show(h1,hex1); show(h2,hex2); show(h3,hex3); show(h4,hex4); show(h5,hex5); show(h6,hex6); show(h7,hex7); end else if(sw[17:16]==3) begin o1=sw0[15:12]*10+sw0[11:8]; o2=sw0[7:4]*10+sw0[3:0]; if(o1>=o2) begin s=o1-o2; h7=sw0[15:12]; h6=sw0[11:8]; h5=sw0[7:4]; h0=s%10; h1=s/10%10; h2=s/100%10; h3=16; h4=sw0[3:0]; show(h0,hex0); show(h1,hex1); show(h2,hex2); show(h3,hex3); show(h4,hex4); show(h5,hex5); show(h6,hex6); show(h7,hex7); end else begin s=o2-o1; h7=sw0[15:12]; h6=sw0[11:8]; h5=sw0[7:4]; h0=s%10; h1=s/10%10; h2=s/100%10; h3=10; h4=sw0[3:0]; show(h0,hex0); show(h1,hex1); show(h2,hex2); show(h3,hex3); show(h4,hex4); show(h5,hex5); show(h6,hex6); show(h7,hex7); end end end task show; input reg[3:0] decc; output reg[6:0] out; if(decc==0) out=7'b1000000; else if(decc==1) out=7'b1111001; else if(decc==2) out=7'b0100100; else if(decc==3) out=7'b0110000; else if(decc==4) out=7'b0011001; else if(decc==5) out=7'b0010010; else if(decc==6) out=7'b0000010; else if(decc==7) out=7'b1111000; else if(decc==8) out=7'b0000000; else if(decc==9) out=7'b0011000; else if(decc==10)out=7'b0111111; else out=7'b1111111; endtask endmodule
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