I am making a program that solves for Standard Deviation unfortunately my program doesn't print correct answer but just prints the 1.#J or the infinity error if I am right I can't figure out what is the problem with my codes can someone help me to debug.. because I don't have enough knowledge about pass by reference here is the code Code: //Prototypes double Standard(); double EvalStandard(double mean,double calc,int b,double data[]){ int a; double sum,sd; for(a=0;a<b;a++){ sum=sum+data[a]; } mean=sum/a; for(a=0;a<b;a++){ calc+=pow((data[a]-mean),2); } sd=sqrt(calc/(b-1)); return sd; } //Function //Standard Deviation Function double Standard(){ int SA,a,b; double sum=0,data[10],mean,calc,sd; char error[128]; do{ system("cls"); printf("Standard Deviation\n\n"); printf("Enter the Number of Data (max. 10): "); scanf("%s",&error); b=atoi(error); if(b>10||b==0){ system("cls"); printf("Invalid input. Please try again!!!\n"); printf("Please press the spacebar to continue!!\n"); getche(); } }while(b>10||b==0); for(a=0;a<b;a++){ printf("Enter the Actual Values of Data %d: ", a+1); scanf("%s",&error); data[a]=atof(error); } if(b==1){ printf("The Standard Deviation the Data is 0\n"); printf("Please press the spacebar to continue!!"); getche(); } else{ sd=EvalStandard(mean,calc,b,data); printf("The Standard Deviation the Data is %.2lf\n",sd); printf("Please press the spacebar to continue!!"); getche(); } }

I have checked your code in linux environment and I inserted some of the lines to manage the flow. When I execute I got the error "undefined reference to `sqrt'".Because in the program you used a math.h function. Then I compile the program using -lm option.It is for the math.h functions. cc -lm test_program.c Then I ran the program It got work. Code: #include<stdio.h> #include<math.h> //Prototypes double Standard(); double EvalStandard(double mean,double calc,int b,double data[]){ int a; double sum,sd; for(a=0;a<b;a++){ sum=sum+data[a]; } mean=sum/a; for(a=0;a<b;a++){ calc+=pow((data[a]-mean),2); } sd=sqrt(calc/(b-1)); return sd; } //Function //Standard Deviation Function double Standard(){ int SA,a,b; double sum=0,data[10],mean,calc,sd; char error[128]; char c; while(1) { do{ system("clear"); printf("Standard Deviation\n\n"); printf("Enter the Number of Data (max. 10): "); scanf("%s",&error); b=atoi(error); if(b>10||b==0){ system("clear"); printf("Invalid input. Please try again!!!\n"); printf("Please press the spacebar to continue!!\n"); c=getchar(); } }while(b>10||b==0); for(a=0;a<b;a++){ printf("Enter the Actual Values of Data %d: ", a+1); scanf("%s",&error); data[a]=atof(error); } if(b==1){ printf("The Standard Deviation the Data is 0\n"); printf("Please press the spacebar to continue!!"); getchar(); if((c=getchar())!=' ') break; } else{ sd=EvalStandard(mean,calc,b,data); printf("The Standard Deviation the Data is %.2lf\n",sd); printf("Please press the spacebar to continue!!"); getchar(); if((c=getchar())!=' ') break; } } } main() { Standard(); }