Hexadecimal calculator

Hi guys, down below you will see my embarrassing attempt at coding lol

Code:

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#include<stdio.h>intadd(p,q);intsub(p,q);

intmain(){intn1,n2;chars[4];printf("Typeinanexpression:\n");scanf("%x%s%x",&n1,&s,&n2);
if(s=="add")printf("%x",add(n1,n2));

}
intadd(p,q){floatc;c=p+q;returnc;}intsub(p,q){floatc;c=q-p;returnc;
}


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It needs to work like this

example: 41 add 49

answer = 8a

there is more to this but for right now I hope you guys can help me with this. Thank you guys :)

Perhaps you could post code from a decent editor into a decent browser.
Your code is a format train wreck.

How old is your book? This code will not be compiled by any decent recent compiler

Code:

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#include<stdio.h>

int add(p,q);
int sub(p,q);

int main() {
    int n1,n2;
    char s[4];
    printf("Type in an expression:\n");
    scanf("%x%s%x",&n1,&s,&n2);
    if(s=="add")
        printf("%x",add(n1,n2));

}
int add(p,q) {
    float c;
    c=p+q;
    return c;
}
int sub(p,q) {
    float c;
    c=q-p;
    return c;
}

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Code:

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Compiling src/test.cpp -> obj/test.o
Makefile:52: recipe for target 'obj/test.o' failed
src/test.cpp:3:9: error: ‘p’ was not declared in this scope
 int add(p,q);
        ^
src/test.cpp:3:11: error: ‘q’ was not declared in this scope
 int add(p,q);
          ^
src/test.cpp:3:12: error: expression list treated as compound expression in initializer [-fpermissive]
 int add(p,q);
            ^
src/test.cpp:4:9: error: ‘p’ was not declared in this scope
 int sub(p,q);
        ^
src/test.cpp:4:11: error: ‘q’ was not declared in this scope
 int sub(p,q);
          ^
src/test.cpp:4:12: error: expression list treated as compound expression in initializer [-fpermissive]
 int sub(p,q);
            ^
src/test.cpp: In function ‘int main()’:
src/test.cpp:10:30: error: format ‘%x’ expects argument of type ‘unsigned int*’, but argument 2 has type ‘int*’ [-Werror=format=]
    scanf("%x%s%x",&n1,&s,&n2);
                              ^
src/test.cpp:10:30: error: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[4]’ [-Werror=format=]
src/test.cpp:10:30: error: format ‘%x’ expects argument of type ‘unsigned int*’, but argument 4 has type ‘int*’ [-Werror=format=]
src/test.cpp:11:11: error: comparison with string literal results in unspecified behaviour [-Werror=address]
    if(s=="add")
          ^
src/test.cpp:12:30: error: ‘add’ cannot be used as a function
        printf("%x",add(n1,n2));
                              ^
src/test.cpp: At global scope:
src/test.cpp:15:9: error: redefinition of ‘int add’
 int add(p,q) {
        ^
src/test.cpp:3:5: note: ‘int add’ previously defined here
 int add(p,q);
    ^
src/test.cpp:15:9: error: ‘p’ was not declared in this scope
 int add(p,q) {
        ^
src/test.cpp:15:11: error: ‘q’ was not declared in this scope
 int add(p,q) {
          ^
src/test.cpp:20:9: error: redefinition of ‘int sub’
 int sub(p,q) {
        ^
src/test.cpp:4:5: note: ‘int sub’ previously defined here
 int sub(p,q);
    ^
src/test.cpp:20:9: error: ‘p’ was not declared in this scope
 int sub(p,q) {
        ^
src/test.cpp:20:11: error: ‘q’ was not declared in this scope
 int sub(p,q) {
          ^
cc1plus: all warnings being treated as errors
make: *** [obj/test.o] Error 1

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