TYBcs OS-Syspro Slip 4-1 | IProgramX

#include<stdio.h>
#include<stdlib.h>

int mem[100],reg[4],cond[]={0,0,0,0,0,1},opc,op1,op2,pc;
FILE *fp;
char fname[20];

void load()
{
printf("Enter file name:");
scanf("%s",fname);

fp = fopen(fname,"r");
if(fp==NULL)
{
printf("File %s not found.\n",fname);
exit(1);
}

while(fscanf(fp,"%d",&mem[pc])!=-1)
pc++;

fclose(fp);
}

void print()
{
int i;
for(i=0;i<pc;i++)
printf("%06d\n",mem[i]);
}

void run()
{
int i;
pc = 0;
while(1)
{
opc = mem[pc]/10000;
op1 = mem[pc]%10000/1000-1;
op2 = mem[pc]%1000;

switch(opc)
{
case 0: // STOP
return;
case 10:// ADD
reg[op1]+=mem[op2];
break;
case 2: // SUB
reg[op1]-=mem[op2];
break;
case 3: // MULT
reg[op1]*=mem[op2];
break;
case 9: // DIV
reg[op1]/=mem[op2];
break;
case 5: // MOVER
reg[op1]=mem[op2];
break;
case 6: // MOVEM
mem[op2]=reg[op1];
break;
case 7: // COMP
if(reg[op1] < mem[op2])
cond[0]=1;
if(reg[op1] <= mem[op2])
cond[1]=1;
if(reg[op1] == mem[op2])
cond[2]=1;
if(reg[op1] > mem[op2])
cond[3]=1;
if(reg[op1] >= mem[op2])
cond[4]=1;
break;
case 8: // BC
if(cond[op1]==1)
pc = op2-1;

for(i=0;i<5;i++)
cond[i]=0;
break;
case 4: // READ
scanf("%d",&mem[op2]);
break;
case 1:// PRINT
printf("%d\n",mem[op2]);
}
pc++;
}
}

int main()
{
int ch;

while(1)
{
printf("1.Load\n2.Print\n3.Run\n4.Exit\n");
printf("Enter your choice (1-4):");
scanf("%d",&ch);

switch(ch)
{
case 1:
load();
break;
case 2:
print();
break;
case 3:
run();
break;
case 4:
exit(0);
}
}

return 0;
}