Nested FOR Loops in C

Nested for loops have many applications, particularly, in programs dealing with sorting of lists, input/output of multi-dimensional arrays, etc. and also in the evaluation of expressions involving more than one parameter. The code for nested/or loops is given below.

int i, j, k ;

for(i = 0; i<= m; i++)

    for(j = 0; j <= n; j++)

         for(k = 0 ; k <= p; k++)

             {Statements;

             ———-;}

The following program makes use of the nested/or loop to evaluate e^x for different integral values of x (x = 1 to x = 4) by summing the first 10 terms of the following series for each value of x:

In the evaluation there would be two loops: In the inner loop, we calculate the value of the series for a particular value of x, i.e., the first 10 terms is summed up for a value of x. This calculation is repeated for different values of x from x = 0 to x = 4. Program is an example of the required program.

Illustrates evaluation of e^x for integer powers of x from 0 to 4.

#include <stdio.h> 
 void main() 
 { 
    int n = 10,x ,m; 
    float Sum, Term; 
    clrscr(); 
    for(x =0; x<5; x++) 
      { 
        Term = 1; 
        Sum = Term; 
        for( m = 1; m<=n; m++) 
          {  
             Term = Term *x/m; 
             Sum= Sum+ Term; 
          } 
        printf("e to power %d = %f\n", x, Sum);  
      } 
 }  

The output is given below.