Thread: Basic Calculator

  1. #16
    Fear the Reaper...
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    Aug 2005
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    Toronto, Ontario, Canada
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    625
    You might also want to get a better IDE. Notepad isn't particularly that good for writing code.
    Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction

  2. #17
    Registered User
    Join Date
    Mar 2006
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    725
    The one-and-only Notepad -- comes with all versions of W*ndows by default; small footprint, easily adaptable to various languages and development environments. A great code editor in all respects. Far superior to Dev-C++ and MSVC.
    Code:
    #include <stdio.h>
    
    void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){
    puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9
    /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i]
    ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][
    t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}

  3. #18
    Registered User
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    Nov 2006
    Location
    Rockdale, IL
    Posts
    11
    Okay, we have very good news. The calculator has came to life! YAY!

    Code:
    /* C-Calculator by Matthew Nicola */
    /* Mid-Term project of M. Fagan's C Programming Class */
    
    #include <stdio.h>
    #include <conio.h>
    
    /*This is where the coding takes place:*/
    
    #pragma argsused
    int
    main(void)
    
    
    {
        double mainval,        /* The starting value for the program */
               memory,         /* Holds memory value for memory functions */
               newval,         /* This modifies the main value by operation */
               exit1;          /* Prevents breaking of loop */
        
        char   opr;            /* Term for basic functions */
        
        exit1 = 0;
        mainval = 0;
        memory = 0;
    
     /* Calculator Introduction */
     
     printf("Welcome to Matt Nicola's C Calculator!\n");
     printf("Enter an operator and then enter the value\n");
     printf("to correspond with the operator. Enjoy!\n\n");
     printf("Enter H in operator for basic commands.\n\n");
     
     while (exit1 == 0) {
           
            printf("\nMEMORY: %lf", memory);
            printf("\nThe current value is %lf", mainval);
        
            printf("\n\nEnter the operator to begin: ");
            scanf("%c", &opr);
     
     switch (opr) {
    
    	case '+':        /* Addition */
    
    		printf("\nEnter a value to add to the main value. ");
    		scanf("%lf", &newval);
    		mainval = mainval + newval;
    		break;
    
    	case '-':        /* Subtraction */
    
    		printf("\nEnter a value to subtract from the main value. ");
    		scanf("%lf", &newval);
    		mainval = mainval - newval;
    		break;
    
    	case '*':        /* Multiplication */
    
    		printf("\nEnter a value to multiply the main value. ");
    		scanf("%lf", &newval);
    		mainval = mainval * newval;
    		break;
    
    	case '/':        /* Division */
    
    		printf("\nEnter a value to divide the main value. ");
    		scanf("%lf", &newval);
    		mainval = mainval / newval;
    		break;
    
    	case 'C':        /* Clear */
    	case 'c':
    
    		mainval = 0.0;
    		printf("\nThe main value has been cleared.\n");
    		break;
    
    	case 'A':       /* Add to memory */
    	case 'a':
    
    		printf("\nEnter a value to add to the memory. ");
    		scanf("%lf", &newval);
    		memory = memory + newval;
    		break;
    
    	case 'D':       /* Subtract from memory */
    	case 'd':
    
    		printf("\nEnter a value to deduct from memory. ");
    		scanf("%lf", &newval);
    		memory = memory - newval;
    		break;
    
    	case 'R':        /* Return the memory */
    	case 'r':
    
    		mainval = memory;
    		printf("\nMemory has returned to the main value.\n");
    		break;
    
    	case 'H':        /* Gives basic commands to user */
    	case 'h':
    
    		printf("\nHELP CONTENTS\n\n");
    		printf("Basic operations comply to their sign.\n");
    		printf("c = Clear the main value.\n");
    		printf("a = Add value to memory.\n");
    		printf("d = Subtract a value from memory.\n");
    		printf("r = Place the memory value into the main value.\n");
    		printf("x = Clear the value of the memory.\n");
    		printf("e = Exit the program.\n\n");
    		break;
    
    	case 'X':        /* Clear the memory */
    	case 'x':
    
    		memory = 0.0;
    		printf("\nThe memory has been cleared.\n");
    		break;
    
    	case 'E':        /* Exit program */
    	case 'e':
    
    		printf("\nThank you for using the calculator. Enter any key");
    		printf("\nand press ENTER to exit the program.");
    		scanf(" ");
    		exit1 = 1;
    		break;
    
    	default:
    
    		printf("\nThat case does not comply to the operator.\n");
    		break;
    
    		}	/* End of Switch statement. */
    		}	/* End of While statement. */
    
    	return (0);
    }
    There's just two things to take care of with this.
    - Reduce the value to its hundredths place (o.oo)
    - Take care of the bug that's making my program repeat something once everytime I enter a value.

    At least it still works, but I just have one bug to take care of.

  4. #19
    Fear the Reaper...
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    Aug 2005
    Location
    Toronto, Ontario, Canada
    Posts
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    You may want to look into your use of scanf. scanf is nasty. I bet it's filling your buffer with newlines that you probably don't want.
    Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction

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