#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
void main()
{
char opcode[10],operand[10],label[10],a[10],ad[10],symbol[10],ch;
char code[10][10],code1[10][10]={"33","44","53","57"};
char mnemonic[10][10]={"START","LDA","STA","LDCH","STCH","END"};
char mnemonic1[10][10]={"LDA","STA","LDCH","STCH"};
int locctr,start,length,i=0,j=0,k,l=0;
int st,diff,address,add,len,actual_len,finaddr,prevaddr;
FILE *fp1,*fp2,*fp3,*fp4,*fp5,*fp6,*fp7;
clrscr();
fp1=fopen("INPUT.DAT","r");
fp2=fopen("SYMTAB.DAT","w");
fp3=fopen("INETERMED.DAT","w");
fscanf(fp1,"%s%s%s",label,opcode,operand);
if(strcmp(opcode,"START")==0)
{
start=atoi(operand);
locctr=start;
fprintf(fp3,"%s\t%s\t%s\n",label,opcode,operand);
fscanf(fp1,"%s%s%s",label,opcode,operand);
}
else
locctr=0;
while(strcmp(opcode,"END")!=0)
{
fprintf(fp3,"%d",locctr);
if(strcmp(label,"**")!=0)
fprintf(fp2,"%s\t%d\n",label,locctr);
strcpy(code[i],mnemonic[j]);
while(strcmp(mnemonic[j],"END")!=0)
{
if(strcmp(opcode,mnemonic[j])==0)
{
locctr+=3;
break;
}
strcpy(code[i],mnemonic[j]);
j++;
}
if(strcmp(opcode,"WORD")==0)
locctr+=3;
else if(strcmp(opcode,"RESW")==0)
locctr+=(3*(atoi(operand)));
else if(strcmp(opcode,"RESB")==0)
locctr+=(atoi(operand));
else if(strcmp(opcode,"BYTE")==0)
++locctr;
fprintf(fp3,"\t%s\t%s\t%s\n",label,opcode,operand);
fscanf(fp1,"%s%s%s",label,opcode,operand);
}
fprintf(fp3,"%d\t%s\t%s\t%s\n",locctr,label,opcode,operand);
length=locctr-start;
fcloseall();
printf("\n\nThe contents of Input file:\n\n");
fp1=fopen("INPUT.DAT","r");
ch=fgetc(fp1);
while(ch!=EOF)
{
printf("%c",ch);
ch=fgetc(fp1);
}
printf("\n\nLength of the input program is %d.",length);
printf("\n\nThe contents of Symbol Table:\n\n");
fp2=fopen("SYMTAB.DAT","r");
ch=fgetc(fp2);
while(ch!=EOF)
{
printf("%c",ch);
ch=fgetc(fp2);
}
fcloseall();
fp4=fopen("ASSMLIST.DAT","w");
fp5=fopen("SYMTAB.DAT","r");
fp6=fopen("INTERMED.DAT","r");
fp7=fopen("OBJCODE.DAT","w");
fscanf(fp6,"%s%s%s",label,opcode,operand);
while(strcmp(opcode,"END")!=0)
{
prevaddr=address;
fscanf(fp6,"%d%s%s%s",&address,label,opcode,operand);
}
finaddr=address;
fclose(fp6);
fp6=fopen("INTERMED.DAT","r");
fscanf(fp6,"%s%s%s",label,opcode,operand);
if(strcmp(opcode,"START")==0)
{
fprintf(fp4,"\t%s\t%s\t%s\n",label,opcode,operand);
fprintf(fp7,"H^%s^00%s^00%d\n",label,operand,finaddr);
fscanf(fp6,"%d%s%s%s",&address,label,opcode,operand);
st=address;
diff=prevaddr-st;
fprintf(fp7,"T^00%d^%d",address,diff);
}
while(strcmp(opcode,"END")!=0)
{
if(strcmp(opcode,"BYTE")==0)
{
fprintf(fp4,"%d\t%s\t%s\t%s\t",address,label,opcode,operand);
len=strlen(operand);
actual_len=len-3;
fprintf(fp7,"^");
for(k=2;k<(actual_len+2);k++)
{
itoa(operand[k],ad,16);
fprintf(fp4,"%s",ad);
fprintf(fp7,"%s",ad);
}
fprintf(fp4,"\n");
}
else if(strcmp(opcode,"WORD")==0)
{
len=strlen(operand);
itoa(atoi(operand),a,10);
fprintf(fp4,"%d\t%s\t%s\t%s\t00000%s\n",address,label,opcode,operand,a);
fprintf(fp7,"^00000%s",a);
}
else if((strcmp(opcode,"RESB")==0)||(strcmp(opcode,"RESW")==0))
fprintf(fp4,"%d\t%s\t%s\t%s\n",address,label,opcode,operand);
else
{
while(strcmp(opcode,mnemonic1[l])!=0)
l++;
if(strcmp(operand,"COPY")==0)
fprintf(fp4,"%d\t%s\t%s\t%s\t%s0000\n",address,label,opcode,operand,code1[l]);
else
{
rewind(fp5);
fscanf(fp5,"%s%d",symbol,&add);
while(strcmp(operand,symbol)!=0)
fscanf(fp5,"%s%d",symbol,&add);
fprintf(fp4,"%d\t%s\t%s\t%s\t%s%d\n",address,label,opcode,operand,code1[l],add);
fprintf(fp7,"^%s%d",code1[l],add);
}
}
fscanf(fp6,"%d%s%s%s",&address,label,opcode,operand);
}
fprintf(fp4,"%d\t%s\t%s\t%s\n",address,label,opcode,operand);
fprintf(fp7,"\nE^00%d",st);
printf("\nObject Program has been generated.");
fcloseall();
printf("\n\nObject Program:\n\n");
fp7=fopen("OBJCODE.DAT","r");
ch=fgetc(fp7);
while(ch!=EOF)
{
printf("%c",ch);
ch=fgetc(fp7);
}
fcloseall();
getch();
} Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!
OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.
#include <stdio.h>
int main()
{
char name[50];
printf("Enter name:");
scanf("%s", name);
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return 0;
}
C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}